Biden on Mattis resignation: Trump admin has 'abandoned' core American beliefs

Former Vice President Joe BidenJoe BidenThe Hill's Morning Report - Pelosi remains firm despite new impeachment push Democrats sense new momentum in Trump tax return fight Chimamanda Ngozi Adichie becomes first African to deliver Yale graduation speech MORE criticized the Trump administration as having "abandoned" American beliefs following Defense Secretary James MattisJames Norman MattisPentagon reporters left in dark as Iran tensions escalate Trump officials slow-walk president's order to cut off Central American aid: report Overnight Defense — Presented by Huntington Ingalls Industries — Trump nominates Shanahan as Pentagon chief | House panel advances bill to block military funds for border wall | Trump defends Bolton despite differences MORE's Thursday resignation announcement. 

"I’ve had disagreements with Secretary Mattis, but we shared the view — long-held by Democrats and Republicans in this nation — that respect for our allies and a commitment to the most important and effective alliances in history made America safer," Biden said on Twitter a few hours after the announcement. 

Biden is weighing a run for the Democratic nomination for president in 2020.

"It is clear this administration has abandoned those core American beliefs. Secretary Mattis’ presence and his voice of reason and experience will be missed in the Pentagon and the Situation Room," he continued in a second tweet. 

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Mattis resigned in a letter to President TrumpDonald John TrumpTrump rips Dems' demands, impeachment talk: 'Witch Hunt continues!' Nevada Senate passes bill that would give Electoral College votes to winner of national popular vote The Hill's Morning Report - Pelosi remains firm despite new impeachment push MORE dated Thursday, and is expected to leave the White House in February.

Biden referenced Mattis's letter in his tweet, loosely quoting Mattis about the United States' relationship with allies. 

"My views on treating allies with respect and also being clear-eyed about both malign actors and strategic competitors are strongly held and informed by over four decades of immersion in these issues,” Mattis wrote. “We must do everything possible to advance an international order that is most conducive to our security, prosperity and values, and we are strengthened in this effort by the solidarity of our alliances.”

"Because you have a right to have a Secretary of Defense whose views are better aligned with yours on these and other subjects, I believe it is right for me to step down from my position," Mattis added.

Biden joined many of Democrats who said they were worried or surprised after the resignation. Sen. Mark WarnerMark Robert WarnerSenate passes bill to undo tax increase on Gold Star military families Dem senator introduces bill requiring campaigns to report foreign contacts Overnight Defense: Congressional leaders receive classified briefing on Iran | Trump on war: 'I hope not' | Key Republican calls threats credible | Warren plan targets corporate influence at Pentagon MORE (D-Va.), vice chair of the Senate Intelligence Committee, suggested the Trump administration would be destabilized by the defense secretary's departure, and House Minority Leader Nancy Pelosi (D-Calif.) told reporters: "I’m sad. I’m shaken by it. I had so much respect for him.” 

Biden and Mattis share a complicated past. Former President Obama is accused of pushing Mattis out of his position in Central Command during in 2013.