Republican Sen. Pat Toomey says Trump's claims of 'large-scale fraud and theft of the election are just not substantiated'

• President Donald Trump has rallied against mail-in voting for months, baselessly claiming that Democrats would engage in rampant voter fraud.
• While some Republican congressmen have boosted Trump's claims, other GOP congressmen and former members of Trump's team are denying the allegations.
• The race was called for President-elect Joe Biden by Decision Desk HQ and Insider on Friday morning after Biden overtook Trump in Pennsylvania.
• See the live coverage and full results from the US presidential election.

Republican Sen. Pat Toomey of Pennsylvania on Friday morning offered what was perhaps the most forceful pushback so far on President Donald Trump's false claims that the election is being stolen from him. President-elect Joe Biden was projected as the winner of the election by Decision Desk HQ and Insider on Friday morning.

"The president's allegations of large-scale fraud and theft of the election are just not substantiated. I'm not aware of any significant wrongdoing here," Toomey said on "TODAY."

A number of other top Republicans have echoed Trump's lies about the election.

House Minority Leader Kevin McCarthy repeated Trump's false claim that he won the election. In an appearance on Fox News on Thursday night, he said "President Trump won this election, so to everyone who is listening: do not be quiet, do not be silent about this. We cannot allow this to happen before our very eyes, we need to unite together."

GOP Sen. Ted Cruz of Texas also appeared on Fox News to defend Trump.

"What we've been seeing tonight, what we've been seeing the past few days. It's partisan, it's political, and it is lawless," Cruz said. "And we're seeing this pattern in Democratic city after Democratic city, but the worst in the country right is Philadelphia, Pennsylvania where they're not allowing election observers in despite clear state law that requires election observers being there."

Cruz's claim about observers is not true, according to a statement from the Philadelphia City Commissioners.

The officials said, "The President and his campaign representatives had falsely claimed throughout the day that their representatives were not allowed in the room. But their counsel admitted at the hearing, after questions from the court, that they had several representatives in the room. They had at least 19 party representatives as observers in the Convention Center this afternoon, and more than 15 in the room while the case was being heard this evening."

Just before the race was called on Friday morning, former national security advisor John Bolton tweeted a response to the Trump campaign's lawsuits and false declarations.

"We Republicans are facing a character test," Bolton tweeted. "All candidates are entitled to pursue appropriate election-law remedies if they have evidence supporting their claims. They should certainly not lie. The first Republican president was called "Honest Abe" for a reason."

In an interview Wednesday morning, Bolton told Sky News that Trump "has cast doubt on the integrity of the entire electoral process clearly for his own personal advantage. It's a disgrace."