Fox News political reporter Paul Steinhauser said Monday an endorsement from Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) for either of her former Democratic primary opponents will likely be inconsequential if she does not do it soon.

“If she waits too long if she waits another week or two, maybe after the Florida primaries on the 17th, it’s going to be almost inconsequential because … the train will have already left the station,” Steinhauser said Monday in an interview on Hill.TV’s “Rising.”

Warren ended her presidential campaign last week after a disappointing finish in Super Tuesday races. She said she will not immediately endorse a candidate.

Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE and Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) are the leading candidates remaining in the field, with the former vice president currently leading in the delegate count.

Steinhauser said he’s not surprised Warren is holding off on backing either candidate.

“She’s in a good situation right now, both Bernie Sanders and Joe Biden would love, love, die to have her backing them,” Steinhauser said. “I think she's going to take her time see what she can get out of both of those gentleman and eventually make a decision and she’s not going to rush into anything.”

Steinhauser said he’s also not writing off Sanders campaign, but “it does look extremely tough for him.” He noted the “mass rush” of endorsements from other former White House hopefuls backing Biden, including Sens. Kamala Harris Kamala HarrisScott Walker helping to prep Pence for debate against Harris: report California family frustrated that governor, Harris used fire-damaged property for 'photo opportunity' Moderna releases coronavirus vaccine trial plan as enrollment pushes toward 30,000 MORE (D-Calif.) and Cory Booker Cory Anthony BookerDHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility Black Voters Matter Fund deploying voter outreach caravans in 12 states to drive turnout MORE (D-N.J.), who announced their endorsements Sunday and Monday, respectively.

“I never take anything for granted, what happens tomorrow if Bernie Sanders either wins Michigan or finishes extremely close to Joe Biden then this race may alter again,” Steinhauser said. “This race has changed so much.”

Biden is leading Sanders by wide margins in recent polls of Michigan, but Sanders similarly trailed in polls ahead of the Michigan primary in 2016 and he ended up narrowly winning the state.

Michigan is one of six states holding primary races Tuesday.