Now what do you suppose they are up to?
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Vice President Joe Biden made a surprise visit to Washington, D.C.’s Naval Observatory on Saturday for a confidential talk with Sen. Elizabeth Warren (D-Mass.), CNN reported.

Biden’s return to the District comes amid buzz he is seriously weighing a 2016 Oval Office bid.

CNN said that two sources confirmed the pair’s face-to-face, the biggest indicator yet that Biden is seriously tempted by an Oval Office bid next year.

“The vice president traveled last minute to Washington, D.C. for a private meeting and will be returning to Delaware,” an aide told CNN. Biden spokeswoman Kendra Barkoff declined further comment on the alleged rendezvous.

CNN initially reported Saturday that Biden arrived in Washington around 11 a.m. and had planned on returning home to Wilmington, Del., later in the weekend.

Warren, a beloved figure in progressive circles, has resisted calls to mount her own presidential candidacy. She reportedly told WBZ radio in Boston on Friday that she considers the 2016 Democratic primary up for grabs.