Trump was impeached by the Democratic-controlled House of Representatives for abuse of power related to his withholding of $391 million in congressionally-approved security aid to Ukraine.
However, according to the RealClearPolitics website, Mr. Trump now has a 44.6% approval rating in collated polls, nearly exactly the same as when he came to office in January 2017.
His assertion, made via tweet, came at a busy moment for Washington which is not only grappling with Trump's impeachment proceedings but also awaiting the results of Monday's all-important Iowa caucuses.
Although Iowa holds the first primary election for the Democratic presidential nomination on Monday - as well as a formal process for the Republican nod - numerous candidates, including Bernie Sanders and Elizabeth Warren, will be forced to return to Washington to hear closing arguments in Trump's Senate trial.
President Donald Trump, accompanied by first lady Melania Trump, waves as they walk on the South Lawn as they depart the White House en route to his Mar-a-Lago resort in Palm Beach, Florida.
He was impeached for abuse of power over pressure on Ukraine to open investigations including into a leading Democratic challenger, Joe Biden.
On Sunday, some of those Republicans senators went on the political talk shows to explain their decision to vote against witnesses, and one of their arguments was that impeachment itself has already taught Trump a lesson.
Democrats argued that every other impeachment trial of United States officials has called witnesses.
The vote was divided across the party-line, as was expected, with Democrats getting only two of the four needed Republicans to side with them on the matter.
Friday evening, Senate Majority Leader Mitch McConnell laid out the details for the rest of the trial.
US presidents who have been impeached or threatened with impeachment by the House of Representatives
U.S. Senator Elizabeth Warren departs the U.S. Capitol following Trump's Senate impeachment trial in Washington, U.S., January 31, 2020.
The president's defense attorneys and some Republicans in Congress have argued that House Democrats should have issued subpoenas to witnesses during their impeachment inquiry past year.
Biden told a Sinclair news reporter in Iowa that her words reinforced his argument that Trump's interest in Ukraine was meant to damage his candidacy.
That is the crux of the case against him.
Just hours after the vote to reject any witness testimony, reports pointed to new potential evidence.
"Specifically, the documents in this category are emails that reflect communications by either the president, the vice president, or the president's immediate advisers regarding presidential decision-making about the scope, duration, and goal of the hold on military assistance to Ukraine", OMB lawyer Heather Walsh argued in a late-night court filing by the DOJ.
When asked if the Senate's partisan vote will set a risky precedent, Alexander said, "If you start out with a partisan impeachment, you're nearly destined to have a partisan acquittal". Senator Lindsey Graham, R-S.C., Chairman of the Judiciary Committee, said he planned to involve Joe Biden in congressional oversight over possible corruption in Ukraine. "That would immobilize the Senate", the 79-year-old Tennessee Republican said in an interview set to air Sunday on NBC's "Meet the Press".
"I think she's a very confused, very nervous woman [.] "I don't think she wanted to do this [.] I think she really knew what was going to happen, and her worst nightmare has happened".
"I think he shouldn't have done it", Alexander said.
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