At the time, Clinton pledged he and Boehner would follow through to help raise funds the remaining $10 million needed to finish the memorial. The memorial plans include a learning center and a "Tower of Voices" containing 40 large wind chimes representing the 40 lives lost when the plane crashed.
Boehner tweeted Monday that he is "proud to be working with Presidents Bush & Clinton to raise funds."
Bush signed the Flight 93 Memorial Act into law in 2002, creating a new national park to commemorate the crew and passengers of the flight. United Flight 93 likely would have been flown into the U.S. Capitol during the 9/11 attacks had passengers not fought the hijackers and ultimately caused the plane to divert and crash in Pennsylvania.
In their speeches last September, Bush and Clinton credited the civilians on the plane for what Bush called the "first counteroffensive of the war on terror."