Generally, Iraqi leaders say they oppose any sanctions because ordinary Iraqis suffered under broad United Nations economic penalties that were imposed after Saddam Hussein invaded Kuwait in 1990.
Monday’s announcement came one day before the Israeli general elections, and the move on the Iranian group could give Prime Minister Benjamin Netanyahu a boost in the final hours of his re-election campaign. Mr. Netanyahu has repeatedly raised the specter of the Iranian threat to Israel and tried to reinforce the notion that his close ties to Mr. Trump strengthen Israeli security.
Last month, in an explicit effort to bolster Mr. Netanyahu, Mr. Trump recognized Israeli sovereignty over the Golan Heights, which Israel seized from Syria in the 1967 war and annexed in 1981; the United Nations considers it occupied territory.
Mr. Netanyahu has stressed the dangers posed by Hezbollah, which was designated a foreign terrorist organization by the United States in 1997 and has close ties to the Revolutionary Guard. He had asserted recently that Hezbollah was trying to set up a base in the Golan Heights. Last month, after visiting with Mr. Netanyahu in Jerusalem, Mr. Pompeo flew to Lebanon and berated officials for tolerating Hezbollah, even though it is a part of the government in Beirut.
“There is a reason that successive administrations have held off designating the I.R.G.C. as a terrorist organization, and why many of Trump’s own military and intelligence officials are said to be highly opposed to the move: The potential blowback vastly outweighs the benefits,” said Jeffrey Prescott, who worked as a senior Middle East director at the White House National Security Council during the Obama administration.
“This isn’t about taking a tough approach to Iran’s support for terrorism,” Mr. Prescott said Monday. “Rather, it will put our service members in Iraq and throughout the region at additional risk with nothing to show in return.”