Dozens responded critically to Rumsfeld's tweet, calling the former defense secretary “delusional” and a “war criminal.”

House Oversight Committee Chairman Darrell Issa joked in a tweet Thursday that President Obama and his dog, Bo, were taking advantage of a White House empty of tourists.

There's a little more room around the @whitehouse for this, now that the tourists are gone ... bit.ly/10Shm4T #Sequester

— Darrell Issa (@DarrellIssa) March 15, 2013

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The former chief of staff to South Carolina Gov. Mark Sanford, who was censured by his state legislature in 2009 after admitting an affair with an Argentine woman, joked on Twitter that "nobody complains when the College of Cardinals goes to Argentina.”

See, nobody complains when the College of Cardinals goes to Argentina. #marksanford

— Scott English (@scott_english) March 13, 2013

The tweet was a reference to Wednesday's election of Argentinian Cardinal Jorge Mario Bergoglio as the next pope. Bergoglio will assume the name Pope Francis I.

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Sen. Rand Paul (R-Ky.) suggested Wednesday that he planned to hold another standing filibuster soon.

Sen. Claire McCaskill (D-Mo.) complained Monday she was subject to a very uncomfortable screening by TSA. 

Rep. John Conyers (D-Mich.), the top Democrat on the House Judiciary Committee, is publicly backing Sen. Rand Paul’s (R-Ky.) filibuster over the Obama administration’s drone-strike policy – despite a Twitter mix-up.

Rep. Justin Amash (R-Mich.) jabbed Sen. John McCain (R-Ariz.) after McCain referred to Amash and two Senate Republicans as "wacko birds."

Sen. Jeff Flake (R-Ariz.) called out C-SPAN on Thursday for misidentifying him as Sen. Dean Heller (R-Nev.). 

Both Flake and Heller are Mormon. 

So what gives, CSPAN? I guess all mormons look alike? twitter.com/JeffFlake/stat…

— Jeff Flake (@JeffFlake) March 7, 2013

Flake actually was confusing C-SPAN's error with the Senate Recording Studio's, according to a number of C-SPAN staffers who quickly responded on Twitter. 

Sens. Rand Paul (R-Ky.) and John McCain (R-Ariz.) on Thursday shared what appeared to be an uncomfortable elevator ride shortly after McCain rebuked Paul on the Senate floor over his nearly 13-hour filibuster.

In the picture, taken by the New York Times photographer Stephen Crowley and posted on his Twitter page, the senators appear to be avoiding eye contact with one another in the small elevator space.

ANATOMY OF AN AWKWARD MOMENT-.McCain and Paul share an unplanned, post-rebuke, elevator ride. #randstand #filibuster twitter.com/Stcrow/status/…

— Stephen Crowley (@Stcrow) March 7, 2013

Early on Thursday, McCain and Sen. Lindsey Graham (R-S.C.), two senior Senate defense hawks, criticized statements Paul made in his attention-grabbing filibuster of CIA nominee John Brennan, saying he had "cheapened" the debate over drone policy by making "ridiculous" arguments.

Paul later shot back that McCain and Graham “think the whole world is a battlefield.”