Now playing
02:04
Trump announces new US-Mexico trade deal
QUEBEC CITY, QC - JUNE 08:  Prime Minister of Canada Justin Trudeau (R) speaks with U.S. President Donald Trump during the G7 official welcome at Le Manoir Richelieu on day one of the G7 meeting on June 8, 2018 in Quebec City, Canada. Canada will host the leaders of the UK, Italy, the US, France, Germany and Japan for the two day summit, in the town of La Malbaie.  (Photo by Leon Neal/Getty Images)
PHOTO: Leon Neal/Getty Images
QUEBEC CITY, QC - JUNE 08: Prime Minister of Canada Justin Trudeau (R) speaks with U.S. President Donald Trump during the G7 official welcome at Le Manoir Richelieu on day one of the G7 meeting on June 8, 2018 in Quebec City, Canada. Canada will host the leaders of the UK, Italy, the US, France, Germany and Japan for the two day summit, in the town of La Malbaie. (Photo by Leon Neal/Getty Images)
Now playing
01:58
US and Canada reach deal on NAFTA
Canadian Prime Minister Justin Trudeau (L) and U.S. President Donald Trump pose for photographs at the White House October 11, 2017 in Washington, DC. The United States, Canada and Mexico are currently engaged in renegotiating the 25-year-old North American Free Trade Agreement.  (Chip Somodevilla/Getty Images)
PHOTO: Chip Somodevilla/Getty Images
Canadian Prime Minister Justin Trudeau (L) and U.S. President Donald Trump pose for photographs at the White House October 11, 2017 in Washington, DC. The United States, Canada and Mexico are currently engaged in renegotiating the 25-year-old North American Free Trade Agreement. (Chip Somodevilla/Getty Images)
Now playing
01:44
Trump says he rejected meeting with Trudeau
justin trudeau ac360 031218
justin trudeau ac360 031218
Now playing
01:36
Trudeau on NAFTA: Focused on working together
PHOTO: Photo Illustration: CNNMoney/Getty Images/Shutterstock
Now playing
02:16
China retaliates after new US tariffs
Now playing
03:59
Land O'Lakes CEO: Farmers need answers on trade
PHOTO: Element Electronics/YouTube.com
Now playing
03:25
US company says it was crippled by Trump's tariffs
Now playing
01:26
WSJ: Trump to impose tariffs on $200B in goods
Now playing
01:45
How the US trade war might impact your beer
PHOTO: Courtesy Ford
Now playing
02:06
Ford won't bring this car to the US
TOPSHOT - US President Donald Trump (L) and China's President Xi Jinping leave a business leaders event at the Great Hall of the People in Beijing on November 9, 2017.
Donald Trump urged Chinese leader Xi Jinping to work "hard" and act fast to help resolve the North Korean nuclear crisis, during their meeting in Beijing on November 9, warning that "time is quickly running out". / AFP PHOTO / Nicolas ASFOURI        (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)
PHOTO: NICOLAS ASFOURI/AFP/AFP/Getty Images
TOPSHOT - US President Donald Trump (L) and China's President Xi Jinping leave a business leaders event at the Great Hall of the People in Beijing on November 9, 2017. Donald Trump urged Chinese leader Xi Jinping to work "hard" and act fast to help resolve the North Korean nuclear crisis, during their meeting in Beijing on November 9, warning that "time is quickly running out". / AFP PHOTO / Nicolas ASFOURI (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)
Now playing
01:56
Can the US win a trade war with China?
Now playing
03:04
China is killing my business. Now tariffs are too
PHOTO: Scott Olson/Getty Images North America/Getty Images
Now playing
02:55
Trump's trade war threatens Midwest farmers
Head-On
PHOTO: CNN
Head-On
Now playing
01:28
Trump: Working toward zero tariffs with EU
Josh Rogin newday 06292018
PHOTO: CNN
Josh Rogin newday 06292018
Now playing
01:40
CNN analyst: US allies are freaked out
(CNN) —  

Canadian officials appeared optimistic Wednesday that a deal to rewrite NAFTA is within reach.

Prime Minister Justin Trudeau said that the United States, Mexico and Canada may be able to come to an agreement by Friday.

“We recognize that there is a possibility of getting there by Friday, but it is only a possibility, because it will hinge on whether or not there is ultimately a good deal for Canada” he said at a press conference in Ontario. “No NAFTA deal is better than a bad NAFTA deal.”

It’s quite a change from Monday when President Donald Trump announced from the Oval Office that the United States had reached a preliminary deal with Mexico, and that he might simply leave Canada out.

Canada had been sidelined for months as officials from the other two countries addressed issues over auto manufacturing. But Canadian Foreign Minister Chrystia Freeland cut a trip to Europe short so that she could rejoin the talks in Washington Wednesday.

Existing Canadian trade policies that protect its farmers could be a big sticking point. The Trump administration wants those to change.

“You go to Wisconsin, you go to Iowa, you go to upstate New York and different places where you have very big farm communities. They’ve been treated very, I would say, in a rough manner by Canada. So, hopefully that will end,” Trump said in an interview that aired Tuesday on RFD-TV.

Some American dairy farmers have complained about Canada’s steep tariff on dairy products, which averages 249%.

The American Farm Bureau has lobbied for a rewrite of NAFTA to eliminate or reduce Canadian tariffs on dairy, poultry eggs and wine, as well as recently implemented barriers to imports of ultra-filtered milk.

“It’s clear the Trump Administration wants open market access for dairy products. It’s a must-have,” said Welles Orr, a senior international trade adviser at Miller and Chevalier, and a former Assistant U.S. Trade Representative.

But many countries have trade policies in place to protect their own agricultural industries. Canada officials are likely to argue that the United States has high tariffs on some products, too, said John Horn, professor of practice in economics at Washington University in St. Louis.

Canada is United States’ second largest trading partner after China. Last year, $341 billion of American goods and services were sold in Canada. About $332 billion of Canadian goods and services were exported to the United States. Dairy only makes up a small amount of the trade.

Experts don’t expect that the changes proposed in the preliminary deal between Mexico and the United States to upset Canada.

It would require more car parts to be made in North America, and to be made by workers earning at least $16 an hour. That could move some manufacturing from Mexico to Canada, Horn said.

“The deal doesn’t read like it would be a massive disruption to existing trade. A lot of this is politics,” Horn said.

The upcoming mid-term elections may put pressure on President Trump to ink a deal as soon as possible. Plus, Mexico’s president-elect, who has criticized Trump, takes office on December 1.

The Trump administration must officially notify Congress about the deal, and it has 90 days to review it. Then, Congress must wait for an economic analysis from the US International Trade Commission before it can vote to officially make the deal law.