Report: Romney to endorse Rubio

Former GOP presidential nominee Mitt RomneyWillard (Mitt) Mitt RomneyNevada rematch pits rural voters against a booming Las Vegas Mitt Romney ahead of Charlottesville anniversary: We must ’consistently reject racism’ The Memo: Charlottesville anniversary puts Trump and race under microscope MORE will endorse Marco RubioMarco Antonio RubioDems make history, and other takeaways from Tuesday's primaries Establishment-backed Vukmir wins Wisconsin GOP Senate primary Florida questions Senate chairman over claim that Russians have ‘penetrated’ election systems MORE’s White House bid, The Huffington Post reported early Sunday.

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The news outlet cited two unidentified sources who said Romney withheld his high-profile endorsement out of respect for Jeb Bush, who ended his campaign late Saturday after a disappointing fourth-place finish in South Carolina primary.

Rubio edged fellow freshman senator Ted Cruz for second place in the Palmetto State, behind Donald TrumpDonald John TrumpDems make history, and other takeaways from Tuesday's primaries Pawlenty loses comeback bid in Minnesota Establishment-backed Vukmir wins Wisconsin GOP Senate primary MORE.  Cruz was once considered to have the inside track on South Carolina due to its strong contingent of evangelical voters and Rubio’s strong showing will give his campaign new life headed into the Nevada caucuses.

The Huffington Post reported that Romney, who easily won Nevada in 2008 and 2012, could endorse Rubio before the GOP caucuses on Tuesday.

A Rubio adviser, however, questioned the report, tweeting on Sunday morning that it would be a "bizarre" strategy not to tell the senator's campaign and break the news in The Huffington Post.

--This report was updated at 9:10 a.m.