In the aftermath of a deadly riot Wednesday, a temporary 7-foot-tall “non-scalable” fence has been built around the perimeter of the U.S. Capitol.

The structure will remain at least until early February, the Secretary of the Army Ryan McCarthy announced. The move comes after complaints that security was ill-prepared for the mayhem that erupted.

Additional National Guard troops will also be deployed, at the request of Washington, D.C., Mayor Muriel Bowser, McCarthy said. The 6,200 troops will come from the National Guards of D.C., Delaware, Virginia, New Jersey, Maryland and New York.

“These personnel and these security measures will be in place for no less than the next 30 days and we will be keeping all of these support mechanisms in place in constant coordination with the Capitol Hill police and the [D.C.] mayor's office," McCarthy said at a press conference.

It was reportedly Vice President Mike Pence, not Trump, who prompted the decision to mobilize the National Guard as rioters stormed the building. A source said Trump had been initially resistant.

The fence decision comes after mobs of Trump supporters stormed and vandalized the Capitol on Wednesday afternoon as congressional members met to certify President-elect Joe Biden’s win in the Electoral College. Four people were killed during in the melee.

The election results were finally certified in a late-night session. Political leaders from both sides of the aisle have blamed Trump for inciting the violence, with many calling for his immediate ouster.