The SOTU may have been all about President Joe Biden, but that doesn't mean there can't also be some Republican infighting, too.

As lawmakers were taking their seats in preparation to hear Biden's address, Sen. Mitt Romney (R-UT) tore into Rep. George Santos (R-NY), who has been caught in numerous lies about his resume and background, and was also accused this week of sexually harassing an aide.

"You don’t belong here,” Romney said to Santos in a heated exchange. He later called Santos a "sick puppy."

“He shouldn’t be in Congress, and they are going to go through the process and hopefully get him out,” Romney continued after the speech. “But he shouldn’t be there, and if he had any shame at all, he wouldn’t be there.”

Santos was caught lying, not just "embellishing"

Santos chose to sit in a prominent location and shook hands with many lawmakers before Biden came into the room. Romney said he should have sat in the back and stayed out of the limelight.

“I didn’t expect that he’d be standing there, trying to shake hands with every senator and the president of the United States,” Romney told reporters later.

Romney also said, “He says that he embellished his record. Look, embellishing is saying you get an A when you get an A-minus. Lying is saying you graduated from a college you didn’t even attend."

Comer also commented about Santos

House Oversight Committee Chairman James Comer (R-KY) also commented on Santos' "questionable" behavior at the SOTU.

“The fact that he was wanting to be in the center of the limelight, it just makes no sense,” Comer said after the speech.

He acknowledged that Santos was entitled to due process, but said he’s “crossed the line, obviously” and “he has a lot of explaining to do."

Santos investigations in House, by law enforcement ongoing

The House Ethics Committee is investigating Santos because of the many falsehoods he allegedly perpetuated.

He is also being investigated by federal, state, and county authorities to see whether he made false statements on any of the paperwork he filed to run for office, which is against the law, as well as the sexual harassment allegation.

New York GOP has called on him to resign, but he has refused so far. He recused himself from all House committees until the investigations are complete, and House Speaker Kevin McCarthy (R-CA) has said he won't get any important committee assignments while the investigation is underway.