A former U.S. Senator is predicting Roy Moore will be expelled from the Senate and could face criminal charges if he's elected on Dec. 12.

Sen. Barbara Boxer, a California Democrat, told Time the Alabama Senate hopeful would likely face a serious investigation from the Senate Ethics Committee.

"If they send a child molester into the United States Senate, the Ethics Committee will conduct an investigation that will leave no stone unturned," Boxer said. "They will reveal other issues and Roy Moore will be expelled, and he'll be lucky if he doesn't have criminal charges filed after that's over."

Moore has been accused of having sexual contact with at least two teenagers in the 1970s, when he was in his 30s and working as an Assistant District Attorney in Etowah County. Republicans and Democrats have called on Moore to resign but he has denied the claims and vowed to remain the in race.

Shortly after the Moore allegations surfaced, questions arose over the possibility the Senate could refuse to seat him if he wins the election. That possibility is unlikely, however, several Senators said they would work to expel Moore from the Senate once he begins in term.

A vote to expel a Senator requires a two-thirds majority or a vote of 48 Democrats and independents and 19 Republicans. The last time it was done was 1862.

Moore faces Democrat Doug Jones on Dec. 12.

Boxer served in the U.S. House from 1983 to 1993 and in the Senate from 1993 to 2016.