Which scientist warned the american government about the involvement of germany with the atomic bomb?

Question: Which scientist warned the american government about the involvement of germany with the atomic bomb?

The pivotal warning to the American government about Germany's potential development of an atomic bomb came from Albert Einstein. In August 1939, Einstein signed a letter, drafted by Hungarian physicist Leó Szilárd and co-signed by fellow physicists Edward Teller and Eugene Wigner, which was sent to President Franklin D. Roosevelt. This letter urged the United States to accelerate its own atomic research and highlighted the risk of Nazi Germany developing nuclear weapons. This correspondence significantly influenced the initiation of the Manhattan Project, America's own nuclear weapon development program. Einstein's action was out of character for the pacifist physicist, but he recognized the urgency of the situation. However, he later expressed regret over his involvement, stating that had he known Germany would not succeed in creating an atomic bomb, he would not have participated.