The US Air Force said it would investigate a uniformed officer who called for the impeachment of President Donald Trump and Vice President JD Vance during a protest event on the steps of the Capitol, Reuters reports.

The active-duty officer, Major Jason Watson, denounced Trump and Vance for actions, including going to war with Iran without congressional authorisation, according to a video of the protest event posted online.

In one part of the video, the US Capitol Police can be seen detainingWatson, who held a protest sign calling for the impeachment, conviction and removal of Trump and Vance.

Without mentioning Watson by name, the office of Air Force Secretary Troy Meink acknowledged reports about an Air Force officer protesting at the Capitol and said in a statement that an investigation “will proceed unimpeded”.