In June 1967, Israel launched a pre-emptive attack on Egypt's airforce, starting the Six-Day War. Following the war, Israel gained the territories of the Golan Heights, the Gaza Strip, and the West Bank.
Antiwar demonstrations increased significantly as more and more American soldiers died in the Vietnam War. Senator William Fulbright held a series of televised hearings in 1966 and 1967 in which he convinced the public that it had been deceived about the causes and "winnability" of the war.
When Defense Secretary McNamara expressed discomfort about the war, he was quietly removed from office.
By early 1968, the Vietnam War had become the longest and most unpopular foreign war in the nation's history. The government failed to justify the war. Casualties exceeded 100,000, and more bombs had been dropped in Vietnam than in World War II.
In 1967, Johnson ordered the CIA to spy on domestic antiwar activists. He also encouraged the FBI to use its counterintelligence program, code-named "Cointelpro," to investigate members of the peace movement.