Trump Michigan Rally 4-28 4
Trump Michigan Rally 4-28 4
Now playing
01:03
Trump: I know things I could say about Tester
Ronny Jackson meets with Sen. Jon Tester on Capitol Hill on April 17, 2018.
PHOTO: Mark Wilson/Getty
Ronny Jackson meets with Sen. Jon Tester on Capitol Hill on April 17, 2018.
Now playing
00:53
Ronny Jackson is no longer Trump's doctor
PHOTO: CNN
Now playing
02:21
Tester: White House called Jackson 'Candy Man'
President Donald Trump boards Air Force One during his departure from Andrews Air Force Base, Md., Monday, April 16, 2018, en route to Florida. (AP/Pablo Martinez Monsivais)
PHOTO: Pablo Martinez Monsivais/AP
President Donald Trump boards Air Force One during his departure from Andrews Air Force Base, Md., Monday, April 16, 2018, en route to Florida. (AP/Pablo Martinez Monsivais)
Now playing
02:49
Trump: Nobody has experience to run VA
Ronny Jackson pauses during the daily White House press briefing at the White House on January 16, 2018.
PHOTO: Alex Wong/Getty Images North America/Getty Images
Ronny Jackson pauses during the daily White House press briefing at the White House on January 16, 2018.
Now playing
01:37
WH staffers: Jackson handed out meds 'like candy'
trump rose garden
PHOTO: CNN
trump rose garden
Now playing
01:23
Trump: Ronny Jackson treated very unfairly
Ronny Jackson listens during the daily White House press briefing at the James Brady Press Briefing Room of the White House January 16, 2018.
PHOTO: Alex Wong/Getty
Ronny Jackson listens during the daily White House press briefing at the James Brady Press Briefing Room of the White House January 16, 2018.
Now playing
01:33
Dr. Jackson gives statement on withdrawal
Ronny Jackson meets with Sen. Jon Tester on Capitol Hill on April 17, 2018.
PHOTO: Mark Wilson/Getty
Ronny Jackson meets with Sen. Jon Tester on Capitol Hill on April 17, 2018.
Now playing
01:37
Source: VA pick got drunk during overseas trip
Ronny Jackson meets with Sen. Jon Tester on Capitol Hill on April 17, 2018.
PHOTO: Mark Wilson/Getty
Ronny Jackson meets with Sen. Jon Tester on Capitol Hill on April 17, 2018.
Now playing
01:23
Whistleblowers detail allegations against Jackson
Rick Santorum newday 04252018
PHOTO: CNN
Rick Santorum newday 04252018
Now playing
01:30
Santorum: How could WH have known about Jackson?
armed forces
PHOTO: CNN
armed forces
Now playing
00:38
Senator slams WH for 'sloppily' vetting Jackson
US President Donald Trump (C) and his White House physician Dr. Ronny Jackson (L) listen as US Secretary of Veterans Affairs David J. Shulkin speaks about new technology used by the Department of Veterans Affairs during an event in the Roosevelt Room of the White House August 3, 2017 in Washington, DC. / AFP PHOTO / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
PHOTO: BRENDAN SMIALOWSKI/AFP/Getty Images
US President Donald Trump (C) and his White House physician Dr. Ronny Jackson (L) listen as US Secretary of Veterans Affairs David J. Shulkin speaks about new technology used by the Department of Veterans Affairs during an event in the Roosevelt Room of the White House August 3, 2017 in Washington, DC. / AFP PHOTO / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Now playing
02:35
Trump taps White House doctor as VA secretary
White House physician Rear Admiral Ronny Jackson speaks at the press briefing at the White House in Washington, DC, on January 16, 2018. / AFP PHOTO / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
PHOTO: NICHOLAS KAMM/AFP/Getty Images
White House physician Rear Admiral Ronny Jackson speaks at the press briefing at the White House in Washington, DC, on January 16, 2018. / AFP PHOTO / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
Now playing
01:34
Dr. Ronny Jackson praises Trump's health (2018)
PHOTO: CNN
Now playing
01:03
WH doctor: Trump requested cognitive exam
(CNN) —  

The chairman of the Senate Veterans’ Affairs Committee refused Monday to agree with President Donald Trump’s criticism of the panel’s top Democrat, Sen. Jon Tester of Montana, nor the President’s call for the Montana Democrat to resign in the wake of the Dr. Ronny Jackson scandal.

“I’m not in the critiquing business,” Sen. Johnny Isakson, a Georgia Republican, told reporters in the Capitol after overseeing a short pro-forma session of the Senate, which is otherwise recessed.

In fact, Isakson defended Tester’s decision to publicly release the allegations against Jackson, saying that “every senator has the right to exercise their options” and “that’s the way it should be.”

Isakson said that since Jackson had withdrawn his nomination to be veterans affairs secretary, the committee is no longer investigating allegations about the White House doctor and problems at the White House Medical Office. Asked if he thought they were true, Isakson pointed to a letter he and Tester sent to the White House last week seeking information about the charges and noted that the White House never responded to it.

“We never got that response back, and that’s why we didn’t have the hearing,” Isakson said.

Trump called over the weekend for Tester to resign over his opposition to Jackson’s nomination. Jackson withdrew from consideration late last week, following a series of allegations related to his professional conduct.

RELATED: VA nominee drunkenly banged on female employee’s door during overseas trip, sources say

“Allegations made by Senator Jon Tester against Admiral/Doctor Ron Jackson are proving false,” Trump wrote in a pair of tweets. “The Secret Service is unable to confirm (in fact they deny) any of the phony Democrat charges which have absolutely devastated the wonderful Jackson family. Tester should resign. The………great people of Montana will not stand for this kind of slander when talking of a great human being. Admiral Jackson is the kind of man that those in Montana would most respect and admire, and now, for no reason whatsoever, his reputation has been shattered. Not fair, Tester!”

Tester said in a statement responding to Trump over the weekend that “It’s my duty to make sure Montana veterans get what they need and have earned, and I’ll never stop fighting for them as their senator.”

Asked if he knew who he would like Trump to pick now to run the VA, Isakson told CNN, “No, but I’m sure we’ll find a good one. Now more than ever it’s important to do.”

CNN’s Matt Korade and Sophie Tatum contributed to this report.