President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's insecurity is fueling his promised probe into voter fraud, House Minority Leader Nancy Pelosi charged Wednesday.

The California Democrat emphasized that there is zero evidence that millions of votes were cast illegally for Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE in November, as Trump has charged repeatedly this week. She said she feels "sorry" for the new commander in chief — to a point.

"For a person who is the newly elected president of the United States to be so insecure as to declare that ... , 'I won the popular vote; 3 to 5 million Americans voted illegally in our country' — to suggest [fraud] and to undermine the integrity of our voting system is really strange," Pelosi said during a press briefing in the Capitol.

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"I, frankly, feel very sad about the president making this claim. I felt sorry for him; I even prayed for him. But then I prayed for the United States of America."

The comments came just hours after Trump announced he'd soon be launching a "major" probe into November's balloting.

"I will be asking for a major investigation into VOTER FRAUD, including those registered to vote in two states, those who are illegal and....even, those registered to vote who are dead (and many for a long time)," Trump tweeted.

"Depending on results, we will strengthen up voting procedures!"

On Monday, Trump huddled at the White House with congressional leaders from both parties, including Pelosi, where he told the group, unbidden, that Clinton won the popular vote only because 3 million to 5 million "illegals" were allowed to participate.

Pelosi on Wednesday said she "had the impression" that Trump thinks the number might be even higher than that.

"I had the impression … that he was saying … that that didn't even include California," Pelosi said, though she did not elaborate.

Claims of voter fraud have been widely rejected by state voting officials representing both parties, and some Republicans appear to be growing tired of Trump's unfounded proclamations.

"I am begging the president, share with us the information you have about this or please stop saying it,” Sen. Lindsey Graham Lindsey Olin GrahamThe Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Senate Democrats' campaign arm announces seven-figure investment to boost Graham challenger Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation MORE (R-S.C.) said Tuesday in an interview with NBC News.

Pelosi noted that Trump's own legal team has dismissed charges of fraud.

"When [Green Party presidential nominee] Jill Stein was making her case about voter irregularities … following the election, the lawyers for Donald Trump testified that there was no voter fraud to justify her request for a recount," she said.

Pelosi said she wonders why Trump is so eager to investigate claims — which have been widely debunked — of mass ballot fraud but has less interest in Russia's interference in the election, which has been confirmed by the nation's top intelligence agencies.

"He wants to investigate something that can clearly be proven to be false. But he resists any investigation of the Russian disruption of our election and any connection to his campaign," she said.

Several House Democrats issued a letter to state attorneys general on Wednesday asking for verified cases of voter fraud.