Trump ripped by conservative columnist for acting ‘like someone who is in collusion with Russia’
President Donald Trump (L) met with his Russian counterpart Vladimir Putin in Finland, taking the strongman at his word that Moscow did not interfere in the 2016 US presidential vote. (AFP/File / Brendan Smialowski)

President Donald Trump's failure to press Vladimir Putin on Russian election interference is undermining his claims of "no collusion," a conservative columnist explained on PBS NewsHour.

Anchor Judy Woodruff interviewed New York Times columnist David Brooks.

"Does it undermine what Robert Mueller did that the president continues to say this whole thing was a hoax?" Woodruff asked.

"It certainly undermines America's democracy," Brooks replied.

"It's like having a conversation with the Japanese Emporer in 1942 and not mentioning Pearl Harbor," he explained. "It was an invasion of this country, an invasion of our democratic process and every American in this country except one understands that."

"Trump wonders why people investigate the idea of Russian collusion and the idea that he's somehow tied to Russia in some nefarious way, well this is why they do it, because in public and in the way he conducts himself, he acts like someone who is in collusion with Russia," he continued.

"And there was probably no collusion, but he certainly acts that way," Brooks noted.

"It's kind of baffling," he added.