"I absolutely believe that Senator Corker was over the line, It's disrespectful to the President of the United States".
Corker, the chairman of the Foreign Relations Committee, last week delivered a rebuke of President Trump saying there must be "radical changes" at the White House after the President said "both sides" were to blame for the violence in Charlottesville, Virginia. "Our nation needs for him to be successful, it doesn't matter whether you're Republican or Democrat we need for our president, the world needs our president to be successful".
The White House on Thursday called Corker's statement about the president "a ridiculous and outrageous claim".
Corker declined to answer questions about whether he will run again.
That reference to President George W. Bush's much criticized handling of Hurricane Katrina in 2005 was Grassley responding to Trump, his aides said in an email.
Corker's remarks last week got a smattering of applause from the crowd and put him in the vanguard of Republican lawmakers uneasy with Trump.
President Donald Trump fired back at Tennessee Republican Senator Bob Corker on Twitter, more than a week after Corker criticized the president. Jeff Flake (R-Ariz.), describing him as "weak on crime & border", and blamed Sen. Corker was also on the shortlist to be picked as Trump's presidential running mate as well as his secretary of state.
After talking with Vice President Mike Pence Friday, Corker said he "applauds the Trump administration for standing with the Venezuelan people".
Corker has not said whether he will run for a third Senate term in 2018. Lamar Alexander and U.S. Rep. Diane Black.
He was also photographed on a golf outing with the president and University of Tennessee football legend Peyton Manning. Trump reluctantly signed it, under threat that Congress would override a veto. "I think the president was rather restrained in his tweet [about Corker] and was absolutely correct".
Corker, a former Chattanooga mayor who was first elected to the U.S. Senate in 2006, has yet to announce his re-election plans for next year.