Senator Bob Corker, chairman of the powerful Senate Foreign Relations Committee, said he fears the nation will be in peril unless Trump makes radical changes at the White House.
"The president has not yet been able to demonstrate the stability nor some of the competence that he needs to demonstrate in order to be successful," Corker told reporters after a townhall in Chattanooga, Tennessee.
As a chairman of the Senate Foreign Relations Committee, Tennessee plays a key role in shaping US' foreign policy.
"We should hope that (Trump) aspires that he does some self-reflection, that he does what is necessary to demonstrate stability, to demonstrate competence, to demonstrate that he understands the character of our nation and works daily to bring out the best of the people in our nation," Corker said.
Democratic Congressman Anthony G Brown said that Trump is unfit for office.
Brown said that Trump's response to the savage actions of white supremacists and extremists in Charlottesville and his convoluted and distorted rationalisation of the murder of Heather Heyer, is "shameful and unbecoming of the president of the US".
Trump, just completing seven months in the White House, is under fire for his response to Saturday's clashes between far-right and counter-protesters in Charlottesville, Virginia, in which he blamed "both sides" for the violence.
The rally was in protest at the removal of a statue of Robert E Lee, a general who fought for the pro-slavery Confederacy during the US Civil War.
"I have expressed great concerns about President Trump's ability to lead our country in the Resolution of No Confidence that I introduced in July with 29 of my colleagues; however, after the president's comments on Saturday and again on Tuesday in response to the horrific events in Charlottesville, I believe the president should be impeached and removed from office," Cohen said.
Cohen is the third Democratic lawmaker to file articles of impeachment against Trump. The other two being Al Green and Brad Sherman.
Meanwhile Tony Schwartz, co-author of the 1987 bestselling 'Art of the Deal' predicted that Trump will soon resign from presidency.
"The circle is closing at blinding speed. Trump is going to resign and declare victory before Mueller and congress leave him no choice," he said in a tweet.
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