The main basis for this claim seems to be statements made based on the political developments during Trump's presidency such as the January 6th Coup and more recent events such as the wide-spread banning of books. These actions are seen by many Holocaust and WW2 survivors as incredibly similar to actions that happened in Germany in the build-up to the Holocaust.
Firstly, an article by the Los Angeles Times from 2022 features interviews with Holocaust survivors about their experiences in the turbulence of Trump's presidency and their thoughts.
One interviewee, Josie Levy Martin, stated, "'I fear not enough good people remember history. Why are so many Republicans on board with Trump, even a year after the Jan. 6, 2021, coup attempt? I worry about political things, such as the large number of judges Trump has appointed, but there are also other changes that deeply concern me.'"
There are other interviewees who speak about similar topics, all stating that the actions that many Republicans are taking are extremely concerning, reminiscent of the environment of Nazi Germany.
Another more recent piece of evidence that I found comes from Grace Linn, a 100 year-old, who spoke against the banning of books in Florida last week. In a school board meeting that she attended, Linn came to the front and spoke against the banning of literature. She made a direct comparison to Nazi Germany, and said, "'One of the freedoms that the Nazis crushed was the freedom to read the books they banned. They stopped the free press and banned and burned books. The freedom to read, which is protected by the First Amendment, is our essential right and duty of our democracy. Even so, it is continually under attack by both the public and private groups who think they hold the truth. Banning books and burning books are the same. Both are done for the same reason — fear of knowledge.'".
Based on this evidence, I believe that the claim is true as it seems many Holocaust survivors see the decisions being made by politicians and many of their constituents remind them of similar ones made by the Nazis before the Holocaust.
Grace Linn Interview: https://www.youtube.com/watch?v=2-ZMP5CFS2M
Grace Linn News Feature: https://www.youtube.com/watch?v=iPOts38tdQY
Los Angeles Times: https://www.latimes.com/opinion/story/2022-01-21/holocaust-survivors-what-worries-them-about-today