The boxes with the electorate votes had time to be taken to safety before protesters entered the congress.
Democrat Senator Jeff Merkley wrote on Twitter.
He pays tribute to the officials who thought of taking the electorate out of the building.
"If our competent staff had not taken them, the mob would have burned them," writes Merkley, who along with other senators has been evacuated to a safe place.
It is unclear when the work of Congress can be resumed, several US media reports.
Several sources tell CNN that they first want the situation to be under control.
According to the channel, several leaders in the congress want approval of the election result to take place already on Wednesday evening.
It also reports The Hill.
Several senators, including Republican Majority Leader Mitch McConnell, say they believe the process can be resumed as early as Wednesday.
- We will be ready tonight.
Everyone is ready to stay and do our job no matter what is required, says Democratic Senator Joe Manchin according to The Hill.
In a statement during the evening, incoming President Joe Biden and Vice President Kamala Harris called for the democratic process to continue.
Members evacuated
The session of Congress where Joe Biden was to be approved as president was paused when protesters broke through the barrier and entered the building.
Members of both the Senate and Congress have been relocated to safe seats.
Several congressional leaders have been evacuated to McNair military base in Washington DC
At midnight Swedish time, 18.00 on the American east coast, the curfew issued by the mayor of Washington DC came into force.
Police said that they secured the Congress of the demonstrators who entered the building.