The US House select committee investigating the January assault on the Capitol building announced Thursday it has issued subpoenas to four allies of former president Donald Trump.

Trump's former chief of staff Mark Meadows, Meadows' deputy Dan Scavino, former acting defense secretary's chief of staff Kash Patel, and former advisor and campaign manager Steve Bannon have been called to appear at depositions in the coming weeks.

It was perhaps the biggest action the commission, made up of a majority of Democratic congressmen and only two Republicans – Liz Cheney and Adam Kinzinger – who are at odds with Trump, has taken so far in its investigations into the assault on Congress.