On “Meet the Press,” Klobuchar compared Trump's behavior to the Watergate scandal, only on a larger scale. President Richard Nixon was nearly impeached because his White House oversaw a 1972 break-in to Democratic headquarters and because he participated in a cover-up afterward. Nixon resigned in August 1974 before he could be impeached.

"That is basically what this president has done on a global basis," Klobuchar told Todd.

Klobuchar isn't the only one to draw the Watergate parallel. Rep. Zoe Lofgren, a member of the Judiciary Committee, said Sunday that she agrees Trump's actions exceeded anything committed by Nixon because at least Nixon "didn't involve involving other foreign nations."

"If you take a look at what the Founding Fathers were concerned about, it was the interference by foreign governments in our political system. That was one of their gravest concerns," Lofgren told CNN's Dana Bash. "Nixon's behavior didn't fall into that range. So, in that way, this conduct is more serious.”

If the House impeaches Trump, Klobuchar would be called from the campaign to sit as a juror in a Senate trial on whether to remove the president from office. Speaking with Bash on Sunday, Klobuchar said she would fulfill her constitutional obligation and "meet whatever obstacle is put in front of me."

"I have many people out there for me if I can't leave for a few weeks," Klobuchar said on “State of the Union.“ "That includes my husband and daughter, who are excellent campaigners. But it also includes all of our endorsers."

Klobuchar added that she feels she is the candidate most capable of beating Trump because of her past success in suburban, rural and urban areas as a senator from Minnesota. She added experience and the ability to connect to moderate voters are crucial — a subtle dig at some of her more leftist or less politically experienced competitors.

"If Donald Trump gets elected, shame on us," Klobuchar said.