U.S. President Donald Trump was vague on Friday about whether he would sign or veto legislation to back protesters in Hong Kong as he tries to strike a trade deal with China, and boasted that he alone had prevented Beijing from crushing the demonstrations with a million soldiers.

In one of his most grandiose statements yet over relations with China, Trump said he had told Chinese President Xi Jinping that crushing the Hong Kong protesters would have "a tremendous negative impact" on efforts to reach an accord to end a 16-month trade war between the United States and China.

"If it weren't for me Hong Kong would have been obliterated in 14 minutes," Trump told Fox News Channel's "Fox & Friends" without offering any evidence.