Senate Majority Leader Mitch McConnell (R-Ky.) lambasted President Donald Trump’s decision to pull U.S. troops from Syria in an op-ed Friday, calling the move a “grave strategic mistake” that threatens to bring “terror to our shores.”

“The combination of a U.S. pullback and the escalating Turkish-Kurdish hostilities is creating a strategic nightmare for our country,” McConnell warned in The Washington Post. The events have “set back the United States’ campaign against the Islamic State and other terrorists. Unless halted, our retreat will invite the brutal Assad regime in Syria and its Iranian backers to expand their influence.”

McConnell also noted that “we are ignoring Russia’s efforts to leverage its increasingly dominant position in Syria to amass power and influence throughout the Middle East and beyond. ... Predictably, our adversaries seem to be relishing these developments.”