Former Massachusetts Gov. Bill Weld William (Bill) WeldRalph Gants, chief justice of Massachusetts supreme court, dies at 65 The Hill's Campaign Report: Biden visits Kenosha | Trump's double-voting suggestion draws fire | Facebook clamps down on election ads Biden picks up endorsements from nearly 100 Republicans MORE (R) said Wednesday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has "lost the capacity to govern," a view he said was shared by White House staffers.

Weld pointed to instances of aides undermining the president and refusing to carry out his orders outlined in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report on the Russia investigation.

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“I think President Trump has lost the capacity to govern. The picture painted by volume two of the Mueller report is [of] someone who cannot be trusted, and all his own people know he can't be trusted," Weld said on CNN.

"And he can't even be obeyed when he gives a direct order. That's a picture of complete malfeasance and nonfeasance," he added.

Weld, who previously ran on the Libertarian Party's ticket for vice president in 2016, is the only announced challenger to Trump in the 2020 Republican Party primary so far.

In an interview Monday, he suggested that America would be "much better off" if Trump resigned and Vice President Pence became president.

“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,” he told MSNBC. “We would be much better off with a President Mike Pence than a President Donald Trump."