Republican Senator John McCain has strongly criticized the 16 years of U.S. military presence in Afghanistan, saying Washington’s efforts to restore peace have failed.

“None of us would say that we are on a course to success here in Afghanistan,” said McCain during a press briefing in the Afghan capital of Kabul on Tuesday, while heading a delegation of bipartisan U.S. senators visiting NATO-coalition headquarters in Afghanistan.

The U.S. senators have called for a new U.S. strategy in Afghanistan in order to turn the tide against Taliban terrorist group and end Washington’s war in the country.

“Winning is getting major areas of the country under control, and working towards some kind of ceasefire with the Taliban,” McCain said. “They will not negotiate unless they think they are losing.”

The United States under George W. Bush invaded Afghanistan in 2001 as part of Washington’s so-called war on terror.

Last year, Afghanistan was named the second-ranking country in people seeking refugee status abroad, behind Syria.

Senator Elizabeth Warren, who is in Afghanistan as well, said she came to get “the view on the ground about what is happening” in Afghanistan.

“We need a strategy in the United States that defines our role in Afghanistan, defines our objective and explains how we can get from here to there,” Warren said.