President Donald Trump is slated to meet face-to-face with Russian President Vladimir Putin this week at the G20 summit in Argentina. But one Senator is going on record to say he doesn’t think that’s a very good idea.

Appearing on New Day Tuesday, Sen. Jeff Merkley (D-OR) argued that a Trump-Putin meeting should not happen while the president is under investigation for colluding with Russia.

“I don’t think [they] should meet one-on-one, and it’s [for] a list of reasons,” Merkley said. “First, he’s under investigation for possible collusion with the Russians. We don’t know what kind of connections he has financially, conflicts of interest. There was no transparency on his last meeting, this one-on-one meeting, where only a translator was there. We still don’t know what was said at that meeting. And quite frankly, there needs to be a strong front with our national security partners present to say what’s acceptable and what’s not. [I] just don’t believe that President Trump is capable on these one-on-one meetings of conveying any form of criticism or setting any sort of boundaries.”

The Senator added that Helsinki meeting between Trump and Putin is more than enough of a red flag, as far as he’s concerned.

“When [Trump] came out [of the meeting], he was just completely reciting Putin’s talking points, like he’d been hypnotized,” Merkley said.

Watch above, via CNN.

Have a tip we should know? [email protected]