The United States intends to launch further strikes at Iran-backed groups in the Middle East, the White House national security adviser said on Sunday, after hitting Tehran-aligned factions in Iraq, Syria and Yemen over the last two days. The United States and Britain unleashed attacks against 36 Houthi targets in Yemen, a day after the US military hit Tehran-backed groups in Iraq and Syriain retaliation for a deadly attack on US troops in Jordan. “We intend to take additional strikes, and additional action, to continue to send a clear message that the United States will respond when our force…