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WATCH: Sen. Flake: “More doubtful” North Korean summit will happen 

Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeCongress raises pressure on Saudi Arabia Flake says he and his family got death threats 'from the right' Trump boosts McSally, bashes Sinema in Arizona MORE (R-Ariz.), a frequent critic of President Trump, says he’s “more doubtful” that the planned meeting between the president and North Korean leader Kim Jong Un, slated for June 12 in Singapore, will happen.

“I don’t know — it looks more doubtful to me,” Flake told The Hill when asked if he thinks the summit will happen, adding, "But you know, I'm glad that we are talking. I’ve never put much hope in that meeting.”

Flake's comments come as North Korea warned earlier this week that it could pull out of the summit due to military exercises by the U.S. and South Korea.

Flake added that he thinks it takes more than one month of “prep work” for a meeting of “that significance.” 

Fellow GOP Sen. Rob PortmanRobert (Rob) Jones PortmanOn The Money: Trump to seek new round of tax cuts after midterms | Mnuchin meets with Saudi crown prince | Trump threatens to cut foreign aid over caravan On The Money: Mnuchin to attend anti-terror meeting in Saudi Arabia | Treasury releases guidance on 'opportunity zone' program | Maxine Waters gets company in new GOP line of attack Election Countdown: O'Rourke brings in massive M haul | Deal on judges lets senators return to the trail | Hurricane puts Florida candidates in the spotlight | Adelson spending big to save GOP in midterms MORE (Ohio) was more optimistic that the Korean summit will go forward despite North Korea’s threats.

“Do I trust them? No,” Portman said, “Do I want to talk with them directly government to government? Yes. And I think we can move forward on that.”

House Armed Services Committee member Rep. Steve Russell (R-Okla.) told The Hill he also predicted “the meeting will still occur,” even if Kim sounds off ahead of time. 

“I guess he doesn’t want to look like a doormat — he’s trying to sound tough or whatever it might be prior to the negotiations — OK, we can live with rhetoric, we can live with that,” Russell said.

Click on the video above to hear the lawmakers in their own words.