The new guidelines will hit offending lawmakers with a $500 fine on the first offense and $2,500 on the second, to be deducted from the lawmakers’ pay, according to a senior Democratic aide.

The crackdown follows at least three House members testing positive for COVID-19 after they spent hours in a crowded secure space while rioters in support of President Trump stormed the Capitol last Wednesday.

Several House Republicans were not wearing masks in that room, in violation of rules in place since July that require all members and staff to wear them in the House chamber and nearby office buildings.