Sen. Al Franken (D-Minn.) claims that "a few" of his Republican colleagues have raised concerns to him regarding President Donald Trump's mental health.
Franken told Jake Tapper on CNN's "State of the Union" that those concerns stem from questions about Trump's truthfulness.
WATCH | Sen. Franken responds to Tapper's question about his GOP colleagues expressing concern over Trump's mental health.
Franken explained that the concern arises "in the way that we all have this suspicion" that "he lies a lot. He says things that aren't true. That's the same as lying, I guess."
As an example, Franken cited Trump's unbacked claim that he would have won the popular vote during the 2016 presidential race if it weren't for the 3-5 million immigrants who voted illegally for the then-Democratic presidential nominee, Hillary Clinton.
In a private meeting at the White House Trump also reportedly told some senators that he would have won New Hampshire's popular vote if it weren't for the voters that were bused in from out of state.
Stephen Miller, a senior policy advisor to Trump doubled down on that same baseless claim during an interview on ABC's "This Week" with George Stephanopoulos Sunday morning. Miller too said there was evidence to back his claim but only cited studies into voter records.
The Associated Press contributed to this report.