In the immediate stages after WW2, the US was trying to allign itself behind the conservative Arab monarchies. Israel was arguably receiving more support from the Soviets than it was from the US. Israel's largest weapons supplier during the War of Independence was Czechoslovakia afterall. The West was trying to make sure weapons didn't get to Palestine. As with later in the Cold War, the US saw the Soviet-backed republican Baathists and similar movements as the enemy and was trying to undercut the Soviet influence by seeming more sympathetic to Arab concerns about Israel.
As the above poster pointed out, the Suez Crisis satisfies the pro-Israeli UK component of the challenge.