"Trump said that Xi should go ahead with building the camps, which Trump thought was exactly the right thing to do."
Republicans will be fine with this, given that they have supported concentration camps being built right here in the United States.
From Bolton's book:
At the opening dinner of the Osaka G-20 meeting in June 2019, with only interpreters present, Xi had explained to Trump why he was basically building concentration camps in Xinjiang. According to our interpreter, Trump said that Xi should go ahead with building the camps, which Trump thought was exactly the right thing to do. The National Security Council’s top Asia staffer, Matthew Pottinger, told me that Trump said something very similar during his November 2017 trip to China.