After waiting more than a month to offer his endorsement of former Democratic rival Hillary Clinton, Sen. Bernie Sanders has revealed why he took so long to offer his support.
"It was a question of bringing the party together around a progressive agenda,'' Sanders told Matt Lauer and Savannah Guthrie on TODAY Wednesday. "What ended up happening is that the Democratic platform now turns out now to be the most progressive platform the Democratic Party has ever had, and I'm proud of that.
"We didn't get everything we wanted, but it is a progressive platform."
RELATED: Hillary Clinton and Bernie Sanders together
Hillary Clinton and Bernie Sanders together
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Democratic U.S. presidential candidate Hillary Clinton and Sen. Bernie Sanders stand together during a campaign rally where Sanders endorsed Clinton in Portsmouth, New Hampshire, U.S., July 12, 2016. REUTERS/Brian Snyder - TPX IMAGES OF THE DAY
LAS VEGAS, NV - October 13: Bernie Sanders and Hillary Clinton pictured at the 2015 CNN Democratic Presidential Debate at Wynn Resort in Las Vegas, NV on October 13, 2015. Credit: Erik Kabik Photography/ MediaPunch/IPX
Sen. Bernie Sanders, of Vermont, left, and Hillary Rodham Clinton laugh during the CNN Democratic presidential debate Tuesday, Oct. 13, 2015, in Las Vegas. (AP Photo/John Locher)
Democratic presidential candidates Hillary Rodham Clinton, left, Sen. Bernie Sanders, I-Vt., center, and former Maryland Gov. Martin O'Malley, talk backstage before the start of the Iowa Democratic Party's Jefferson-Jackson Dinner, Saturday, Oct. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Bernie Sanders, left, offers an apology to Hillary Clinton during a Democratic presidential primary debate Saturday, Dec. 19, 2015, at Saint Anselm College in Manchester, N.H. (AP Photo/Jim Cole)
Democratic presidential candidate, Hillary Clinton and Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. speak during a break at the NBC, YouTube Democratic presidential debate at the Gaillard Center, Sunday, Jan. 17, 2016, in Charleston, S.C. (AP Photo/Stephen B. Morton)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt, reacts to Democratic presidential candidate, Hillary Clinton's answer to a question during a Democratic presidential primary debate hosted by MSNBC at the University of New Hampshire Thursday, Feb. 4, 2016, in Durham, N.H. (AP Photo/David Goldman)
Democratic presidential candidates Sen. Bernie Sanders, I-Vt, left, and Hillary Clinton take the stage before a Democratic presidential primary debate at the University of Wisconsin-Milwaukee, Thursday, Feb. 11, 2016, in Milwaukee. (AP Photo/Tom Lynn)
Democratic presidential candidates, Hillary Clinton and Sen. Bernie Sanders, I-Vt, shake hands before the start of the Univision, Washington Post Democratic presidential debate at Miami-Dade College, Wednesday, March 9, 2016, in Miami, Fla. (AP Photo/Wilfredo Lee)
Democratic presidential candidate Sen. Bernie Sanders, I-V.t, right, speaks as Hillary Clinton listens during the CNN Democratic Presidential Primary Debate at the Brooklyn Navy Yard on Thursday, April 14, 2016 in New York. (AP Photo/Seth Wenig)
Democratic presidential candidate Hillary Clinton listens as Sen.Bernie Sanders, I-Vt. speaks during a rally in Portsmouth, N.H., Tuesday, July 12, 2016, where Sanders endorsed Clinton. (AP Photo/Andrew Harnik)
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The Vermont senator officially endorsed Clinton at an event in Portsmouth, New Hampshire, on Tuesday.
Sanders said in his speech on Tuesday he intends to do everything he can to ensure the former secretary of state is the next president. He echoed those remarks on TODAY Wednesday.
"I suspect that I will speak at the (Democratic) convention, and I suspect that I will be traveling all over this country (to support Clinton),'' Sanders said.
"Hillary Clinton is not a perfect human being. Bernie Sanders is not a perfect human being." Sanders talks emails. https://t.co/37P61aSuyb
Sanders also compared Clinton's campaign to presumptive Republican nominee Donald Trump.
"I think the election of Donald Trump as president will be a disaster for this country,'' Sanders said. "This is a man that does not have, in my view, the temperament to be president of the United States."
Sanders added he has not had discussions with Clinton about her potential running mate or his possible inclusion in a Clinton administration.