By agreeing to subsume its own weapons programme within the Americans', the plan would have given Britain nuclear weapons much sooner than its own target date of late 1952. Although a majority of Americans including Truman supported the proposal, several key officials, including the United States Atomic Energy Commission's Lewis Strauss and Senator Arthur Vandenberg, did not. Their opposition, along with security concerns raised by the arrest of Fuchs, who was working at Harwell, ended the negotiations in January 1950. After Britain developed nuclear weapons through its own efforts, the engineer Sir Leonard Owen stated that "the McMahon Act was probably one of the best things that happened ... as it made us work and think for ourselves along independent lines."