本によると、天安門事件30年の時に米国が声明を出そうとしたが、トランプはどうしてそんなの出す必要があるのだ、今中国と貿易ディールしようとしているのを潰す気か、誰が15年前の天安門事件なんて気にするんだ、と反対したとのこと

また香港問題についても関与したくない、我々にも人権問題がある、とのこと

https://www.businessinsider.com/bolton-trump-didnt-care-30th-anniversary-of-tiananmen-square-massacre-2020-6

President Donald Trump refused to release a statement on the 30th anniversary of the Tiananmen Square massacre because he didn't want to jeopardize his trade deal with China, according to John Bolton's new book.

"Trump refused to issue a White House statement. 'That was 15 years ago,' he said, inaccurately.
'Who cares about it? I'm trying to make a deal. I don't want anything.' And that was that," wrote Bolton, who served as his national security adviser for over a year.

For similar reasons, Bolton said Trump was reluctant to speak out against China's crackdown on pro-democracy protesters in Hong Kong last summer.
"'I don't want to get involved,' and, 'We have human-rights problems too,'" Trump said of the Hong Kong situation, per Bolton.