Former President Donald Trump has said he will stop holding outdoor rallies as part of his presidential campaign. The decision comes almost two weeks after Trump was nearly killed during an assassination attempt on July 13 at an outdoor rally this month in Butler, Pennsylvania.

Two sources familiar with the operations of Trump’s campaign acknowledged the former president’s plan to shift to indoor venues, NBC News reported. Trump has repeatedly held rallies at outdoor venues that hosted thousands of attendees at outdoor venues. Security concerns, however, have necessitated the move to indoors.