The committee to investigate the storming of the US Capitol in January has summoned William Stepien, campaign manager for then-President Donald Trump.
In addition, the former high-ranking Trump adviser Jason Miller and the former National Security Advisor Michael Flynn will also be available to answer questions from MPs, as the House Committee said on Monday.
The summonses and three other people from Trump's environment at the time are also expected to present a number of documents.
The committee of inquiry must bring to light "every detail" of their efforts to sabotage the election result, said chairman Bennie Thompson.
It must be clarified with whom the people in the White House and in Congress were in contact and what they connect with the protests that led to the forcible storming of the Capitol, he said.
Bannon refuses to cooperate
The committee had already summoned Trump's former chief strategist Steve Bannon.
But this refused to cooperate.
The House of Representatives, which was controlled by the Democrats, decided to allow criminal proceedings against Bannon for disregarding Congress.
The decision on criminal proceedings now rests with the Ministry of Justice.
Bannon is suspected of having prior knowledge of plans for violent protests.
Supporters of Republican Trump stormed the US Congress on January 6th.
Five people were killed, including a police officer.
Trump had to face impeachment proceedings for the attack because he had previously incited his supporters in a speech.
In the end, however, he was acquitted.