The head of the US Capitol police on Thursday urged US lawmakers to add permanent fencing and back-up security staff at the Capitol building after a deadly Jan 6 attack.

The push came as US House of Representatives speaker Nancy Pelosi said lawmakers would probably need more funding for security as the “the enemy is within” the House, following a warning by the Homeland Security Department of heightened threats.

The Senate is preparing to conduct its second impeachment trial of former president Donald Trump on a charge of inciting insurrection in a fiery speech on Jan 6 before hundreds of his supporters stormed the Capitol building in a bid to stop the certification...