According to The Intercept, 81% of 2016 Trump voters support removing troops from Afghanistan.
This has not been represented in Congress. Most Senate Republicans just explicitly voted against ending the war in Afghanistan.
On Wednesday evening, Sen. Rand Paul, a libertarian-leaning Kentucky Republican, introduced an amendment to the National Defense Authorization Act that would have brought our troops home from Afghanistan, given those soldiers who served a bonus, and repealed the authorization of force Congress passed in 2001. But in a 60 to 33 vote, the Senate shot it down, with only three Republicans in addition to Paul—Sens. Mike Lee, Mike Braun, and Steve Daines—backing the amendment.