Senate Armed Services Committee Chair John McCain is adding pressure on the Trump administration to create a new strategy for America’s longest military conflict in Afghanistan.

McCain's statement, released Monday, comes after two recent Afghan insider attacks killed three U.S. service members and wounded seven.

“Six months into the new administration, it still has not delivered a strategy,” said McCain, R-Ariz. “We cannot keep going like this. If the administration fails to develop a strategy for success, Congress will need to play a greater role. We owe it to our brave men and women serving in Afghanistan, their families here at home and all of the American people.”

The Trump administration recently announced it will send 4,000 more U.S. troops to Afghanistan. President Trump has delegated authority on troop numbers to Defense Secretary Jim Mattis. In congressional testimony last week, Mattis acknowledged the U.S. is “not winning” the war and he plans to brief his strategy to the White House by mid-July.