Article snippet: Sen. Rex Tillerson. "When you look at the fact that we've got this issue in North Korea and the president continues to kneecap his diplomatic representative, the secretary of state, and really move him away from successful diplomatic negotiations with China, which is key to this, you're taking us on a path to combat," Corker said on "Good Morning America" today. He added that when it comes to the diplomatic efforts underway to handle the rising tensions with North Korea, he would like for Trump to "leave it to the professionals for a while." "The president undermines our secretary of state [and] raises tensions in the area by virtue of the tweets that he sends out," Corker said. Another negotiation Corker wants Trump to stay out of is the tax debate. Trump on Twitter knocked down reports Monday that the tax plan the White House and Republican leadership are drafting would cap retirement savings plan tax benefits. "There will be NO change to your 401(k). This has always been a great and popular opened an investigation into the attack amid questions about how the mission went awry led to the deaths of four U.S. service members. "Those details we don't know, but we do know in that general area there are a lot of people that wish us harm," Corker said. U.S. troops should be in Niger, he said, but he and his fellow GOP senators want to ensure that Congress is "playing the appropriate role" in authorizing military force there. ABC News' Kelly ... Link to the full article to read more