Former House Speaker Nancy Pelosi reacted on "Morning Joe" to the news that Vice President Kamala Harris is poised to pick Minnesota Gov. Tim Walz as her running mate, saying: "Tim Walz is wonderful, and she had many good choices."

"Tim Walz, I know very well. He served in the House. To characterize him as left is so unreal. It's just not -- he's right down the middle. He is a heartland of America Democrat. He was the chair of our Veterans' Affairs Committee, and I don't want anybody to forget that -- he made tremendous, tremendous gains for our veterans," Pelosi said.

"We made more progress that has ever been made in the history of our country since the GI Bill under his leadership," she continued.

Pelosi complimented his background and credentials, including serving in the National Guard.

"So, he brings the security credential. He brings the rural credential. And he will do in rural America," Pelosi said.

"So it's really mystifying to me to see someone that I worked with, shall we say, right down the middle characterized on the left in his regard. He has [Harris'] confidence obviously," she added.

"[Walz] has a great vision for our country. It is about working-class families, about rural America, about our veterans. He has won for governor two times in Minnesota," Pelosi added.

-ABC News' Lauren Peller

Rep. Betty McCollum, D-Minn., praised Gov. Tim Walz on Tuesday, calling him a "rock-solid Democrat."

"Tim Walz is my friend and a former colleague whose Midwest values are rooted in selfless service to our nation, caring for his neighbors, and inspiring students, soldiers and citizens to stand together, dream bigger and never give up," she said in a statement, reacting to the news that Vice President Kamala Harris is poised to pick the Minnesota governor as her running mate.

"Tim is a rock-solid Democrat, a teacher, a football coach, a veteran and a leader who will defend our freedoms and will work to improve the lives of all Americans in every corner of our country," she said.

-ABC News' John Parkinson

Donald Trump on Tuesday reacted to the news that Vice President Kamala Harris is poised to pick Minnesota Gov. Tim Walz as her running mate.

Trump, in a campaign email, claimed Walz "would be the worst VP in history" and said the governor was "even worse" than Harris.

The pro-Trump super PAC MAGA Inc., a separate entity from the Trump campaign, also released a statement, claiming Walz and Harris are "both far-left radicals that don’t know how to govern."

-ABC News' Rick Klein, Soorin Kim, Lalee Ibssa and Kelsey Walsh

House Majority Whip Tom Emmer of Minnesota, a Republican, criticized Minnesota Gov. Tim Walz, who is poised to be Harris' pick for vice president.

In a post on X, Emmer said, "It's not surprising @KamalaHarris picked Tim Walz to be her running mate — he embodies the same disastrous economic, open-borders, and soft-on-crime policies Harris has inflicted on our country the last four years."

-ABC News' Lauren Peller