Utah Sen. Mitt Romney has crossed the line in the impeachment trial of President Donald Trump by committing a crime for which he could be sent to jail.

The senator, who has been a thorn in the side of the president since he began campaigning in 2015, broke Senate rules in, what could be described as, an act of defiance.

The senator was caught drinking chocolate milk from a bottle when Senate rules state that senators are only allowed to drink milk and water from a glass.

A ridiculous rule yes, but one that could actually lead to him being placed in handcuffs, arrested and put in jail.

At the start of each day of the impeachment trial senators are told by the Sergeant At Arms that if they break Senate rules they face the “pain of imprisonment.”

One of Sen. Romney’s aides informed him of the rule and he then left the Senate chamber with the bottle.

Romney is a known fan of chocolate milk as his wife, Ann Romney, attested to in a 2012 interview, calling the beverage is his “guilty pleasure.”

“Normal Senate rules prohibit food and drink on the floor, but the body has imposed additional rules for President Donald Trump’s impeachment trial, including barring iPhones and prohibiting talking or standing. Water is served to lawmakers by pages, who give them the option of still or sparkling,” Business Insider said.

“Milk is allowed via a precedent that dates back to 1966. Riddick’s Senate Procedure states: “Senate rules do not prohibit a Senator from sipping milk during his speech.” Though food is not allowed on the Senate floor, an exception has long been granted to the so-called ‘candy desk.’

“At least four other senators — Wisconsin Democrat Tammy Baldwin, Arkansas Republican Tom Cotton, North Carolina Republican Richard Burr, and Texas Republican Ted Cruz — have been spotted drinking milk in the Senate chamber during the impeachment trial,” it said.

The issues with Sen. Romney go far beyond chocolate milk and breaking the Senate rules, as if daring Senate Majority Leader and Kentucky Sen. Mitch McConnell to stop him.

He is one of the handful of Republican senators, which includes Sens. Susan Collins and Lisa Murkowski, who want to have witnesses heard at the impeachment trial.

“I, of course, will make a final decision on witnesses after we’ve heard from not only the prosecution, but also the defense,” he said on Monday. “But I think at this stage it is pretty fair to say John Bolton has a relevant testimony to provide.”

But calling witnesses is not going to help Democrats, as Senator Lindsey Graham said to The Washington Examiner.

“I’ll make a prediction. There’ll be 51 Republican votes to call Hunter Biden, Joe Biden, the whistleblower, and the DNC staffer [Alexandra Chalupa],” the senator said.

If Romney thinks he is injuring the president he is incorrect, and he could be damaging his own chances to get elected again.