Notwithstanding the success of the March, the larger struggle was far from over. Three weeks later, a bomb exploded on Sunday, September 15 at the 16th Street Baptist Church in Birmingham; by the end of the day, four African American children had died in the explosion, and two other children shot to death in the aftermath. Due to this resurgent violence, the civil rights legislation underwent some drastic amendments that critically endangered any prospects for its passage. An outraged president called congressional leaders to the White House and by the following day the original bill, without the additions, had enough votes to get it out of the House committee. Gaining Republican support, Senator Everett Dirksen promised the legislation would be brought to a vote, preventing a Senate filibuster. The following summer, on July 2, the guarantees Kennedy proposed in his June 1963 speech became federal law, when President Johnson signed the Civil Rights Act of 1964.