Acting Customs and Border Protection Commissioner John Sanders is resigning, he said in a message sent to agency employees, amid the dramatic increase in the number of undocumented migrants crossing the border and a fight over how to address it.

First lady Melania Trump announced that her communications director, Stephanie Grisham, is the new White House press secretary. CNN's Kate Bennett reports.

The US military conducted a major cyberattack on an Iranian proxy group with forces in Iraq, Syria and inside Iran in the days after Iran shot down a US drone, according to two US officials with knowledge of what happened.

Sen. Bernie Sanders unveiled a plan to cancel $1.6 trillion of student loan undergraduate and graduate debt for approximately 45 million people. His ambitious plan has no eligibility limitations and would be paid for with a new tax on Wall Street speculation.

Treasury Secretary Steve Mnuchin outlined the new sanctions against Iran, saying "these sanctions are all very important for recent activities" and will "lock up billions of dollars more in assets" that support the office of the Ayatollah Khomeini.

President Donald Trump announced new sanctions against Iran on Monday in retaliation for the downing of a US drone last week.

In an interview on NBC's "Meet the Press," President Donald Trump said he decided a strike that would kill 150 people, because it was "not proportionate" to Iran striking down an unmanned drone.

President Donald Trump speaks to the media in the wake of Iran shooting down an American drone.

The Pentagon has released a video that they claim shows Iran shooting down a US drone. CNN's Barbara Starr reports.

Former Vice President Joe Biden is facing criticism for pointing to two segregationist senators as examples of colleagues he could work with during an era where "at least there was some civility" in the Senate.

Secretary of State Mike Pompeo said President Trump does not want war with Iran, adding that the Iranians are being "woefully misled" by the country's leaders.

Rep. Justin Amash (R-MI) stepped down from the conservative Freedom Caucus less than a month after becoming the first Republican congressman to accuse President Trump of "impeachable conduct."

Biden and Harris ramp up their time in Iowa, new ways for campaigns to raise money, figuring out what went wrong for Democrats in Florida in 2018, how to survive in a GOP primary, and the changing Republican Party under Donald Trump. That and more in this week's Inside Politics forecast.

CNN's Michael Warren breaks down the numbers that stick out in the public spending report for President Donald Trump's super PAC, America First Action.

CNN's John King discusses former Vice President Joe Biden's campaign after they were accused of plagiarizing language in his climate plan.