President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE will not be “pushed around” by Russian President Vladimir Putin Vladimir Vladimirovich PutinRussia: US trying to foment revolution in Belarus The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep US must demand equal access to Russian airwaves MORE, first son Eric Trump Eric Frederick TrumpNFL struggles with message of 'unity' in opening week Sunday shows preview: Protests continue over shooting of Blake; coronavirus legislation talks remain at impasse Trump International Hotel in Vancouver closes permanently MORE says.

“If they disrespect us and if they cross us, fine. There will be no one harder — he has got more backbone than anybody. We’re no worse off than we were before. Maybe we’re finding that we can’t be,” Eric Trump told The Daily Telegraph.

The president has faced criticism from both Democratic and Republican lawmakers for first signaling that he was open to warmer ties with the Kremlin. The FBI as well as House and Senate committees are investigating Russian interference in last year's U.S. presidential election, as well as links between the Trump team and the Kremlin.

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Eric Trump maintained that his father is not in any way tied to Russia, pointing toward last week’s airstrike against Syria. Syrian President Bashar Assad's administration has been receiving political and military support from Russia throughout its civil war.

“He is not a guy who gets intimidated. I can tell you he is tough and he won’t be pushed around,” Eric Trump told the newspaper about his father when asked about the Kremlin’s comments that the Syria strike makes a confrontation between the U.S. and Russia more likely.

“The cards will shake out the way they do, but he’s tough.”