On Thursday, Acting Chief of the Capitol Police Yogananda Pittman said she has advocated for continued high security around the building. The threats from Trump supporters indicated that the Capitol could be targeted during an address by President Joe Biden, she told lawmakers.
Ms Pittman said the extremists hope to kill as many members of Congress as possible.
She told members of the House Appropriations Committee: “Members of militia groups that were present on January 6 have stated their desires that they want to blow up the Capitol and kill as many members as possible with a direct nexus to the State of the Union.
“We think that it’s prudent that Capitol Police maintain its enhanced and robust security posture until we address those vulnerabilities going forward.”
A date for Mr Biden’s State of the Union address to Congress has not been announced yet.
After the deadly Capitol attack last month, unprecedented security measures were imposed in Washington as a result.
Fences topped with razor wire and checkpoints manned by the National Guard are some of the measures that have been introduced.
According to Reuters, about 5,000 troops are expected to stay through mid-March.
Mr Trump became the first US President to be impeached twice after he was charged by the House of Representatives with “incitement of insurrection” following the violent protests at Capitol Hill.
READ MORE: Donald Trump is CLEARED of inciting mob attack US Capital
The former President has since been banned from Twitter over the risk of “further incitement of violence”.
Five people died as a result of the January siege, including a Capitol Police officer.
So far, more than 200 people have been charged for their roles in the riot.
Some of those charged have links with far-right fringe groups including the Oath Keepers and Proud Boys.