The violent attacks on the US Congress by supporters of President Donald Trump and his longstanding refusal to accept the 2020 election results have jeopardized the president's political future and tarnished the prospects of top lieutenants and members of his family, current and previous government officials said.

The Republican president has hung up on the possibility of running for president in 2024, and politicians expect him to exert influence over the Republican Party for years to come.

But his behavior on Wednesday - prompting supporters to march on the Capitol to encourage lawmakers to overturn Democratic Joe Biden's victory in the November 3 election, and then failing to quickly get them to quit after the violence - has left the people who work and use work for him and , they say, changing the equation for its post-presidential relevance.

However, Trump supporters break into the Capitol, bypass police, and scour the building, forcing lawmakers and Vice President Mike Pence to flee. One woman died after being shot by police; three other people died of medical emergencies.

Many Republican-elected officials have opposed Trump over the violence, a pause that could diminish his influence over the political future of other Republicans as well as himself.