The Trump administration is reportedly weighing a proposal to send thousands of more troops to Afghanistan, an escalation of the longest war in U.S. history.

This would be a significant about-face from Trump’s public position in the years prior to his presidency. In 2015 he declared that invading Afghanistan in the first place was a “terrible mistake” and the current situation was “a mess,” although he added that “I would leave the troops there begrudgingly” because “that thing will collapse in about two seconds after they leave.”

Before running for president, Trump repeatedly tweeted about the need to end the war, referring to it as a waste of blood and treasure.

The tweet below links to a Fox and Friends interview where Trump denounces the war: “What are we doing there? These people hate us. As soon as we leave, it’s all going to blow up anyway. And you say, ‘What are we doing there?’ We’re spending hundreds of billions of dollars, trillions of dollars on this nonsense.”

Trump’s change of opinion may be spurred by counsel from his National Security Adviser H.R. McMaster. Bloomberg’s Eli Lake reports that McMaster has been the voice inside the administration in favor of escalation.

Top photo: U.S. Marines salute during a handover ceremony at Leatherneck Camp in Lashkar Gah in the Afghan province of Helmand on April 29, 2017.