William Weld, a 73-year-old former Republican governor of Massachusetts, is challenging President Donald Trump during the Republican primaries, and he believes it would benefit the United States if Trump simply resigned from office.

“If he had the self-awareness that Richard Nixon had, sense of shame is too strong a word, but self-awareness is probably too soft a word, he would resign,” Weld said on MSNBC’s The Last Word. Notably, Weld was instrumental in helping in drive to impeach Nixon.

“We would be much better off with a President Mike Pence than a President Donald Trump,” the Republican added.

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However, Weld did appear to warn the Democrats against impeaching Trump, saying, “those boils over at the White House are dying to have impeachment proceedings initiated so that Mr. Trump can scream like a stuffed pig. It’s just going to give him such a delicious talking point the last few months before the election.”

Weld is the first and currently only Republican to venture forth to challenge Trump during the Republican 2020 primaries. “It is time to return to the principles of Lincoln: equality, dignity, and opportunity for all,” he said upon entering his hat into the ring. “There is no greater cause on Earth than to preserve what truly makes America great. I am ready to lead that fight.” Weld had previously ran in 2016 as the Vice President to independent Gary Johnson.

Weld’s entire appearance on MSNBC can be seen below: