Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) told CBS "Late Show" host Stephen Colbert Stephen Tyrone ColbertColbert implores Pelosi to update 'weaponry' in SCOTUS fight: 'Trump has a literal heat ray' The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Juan Williams: Democrats need to bury their divisions MORE on Tuesday night that her campaign is best suited to "build a blue wall around Pennsylvania, Wisconsin and Michigan" and "make Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE pay for it," in a play off of the president's promise to have Mexico pay for a border wall.

The declaration comes three years after Trump upset Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE in the 2016 presidential election by capturing Pennsylvania, Wisconsin, Michigan — three states that were considered the Democratic nominee's "blue wall" that hadn't been won by any GOP candidate since the 1980s.

"We need to win the ticket in the heartland and win those states like Pennsylvania, Wisconsin, Michigan. We can do it. I can do it," Klobuchar told Colbert. "We’re going to build — we are going to build a blue wall around those states and make Donald Trump pay for it. That is our plan.”

The 59-year-old took office in 2007. This campaign marks Klobuchar's first run for president.