Graham jokes to Pompeo: You're the 'longest-serving member of the cabinet, right?'

Sen. Lindsey GrahamLindsey Olin GrahamInspector general testifies on FBI failures: Five takeaways Horowitz offers troubling picture of FBI's Trump campaign probe Conservatives rip FBI over IG report: 'scathing indictment' MORE (R-S.C.) on Tuesday joked with Secretary of State Mike PompeoMichael (Mike) Richard PompeoPompeo: 'No mistake' Trump warned Russian diplomat about election tampering Trump admin hits Iranian shipping network, airline with new sanctions The Hill's Morning Report - Sponsored by AdvaMed - An unusual day: Impeachment plus a trade deal MORE, asking him if he was the longest-serving member of President TrumpDonald John TrumpThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Democrats worried by Jeremy Corbyn's UK rise amid anti-Semitism Warren, Buttigieg duke it out in sprint to 2020 MORE's Cabinet after he mentioned he was about to reach his one-year anniversary in the administration. 

"I'm now nine days short of one year of my time as Secretary of State," Pompeo said while appearing before the Senate Appropriations Committee to testify about State, foreign operations and related programs. 

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"The longest-serving member of the cabinet, right?" Graham quipped in response, prompting awkward laughter from people attending the hearing. 

Pompeo could be seen smiling after Graham made the comment before saying, "Reclaiming my time." 

Graham's comment comes amid a week in which multiple senior officials have exited the administration. Trump announced on Sunday that Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenTrump puts Kushner in charge of overseeing border wall construction: report Hillicon Valley: Google to limit political ad targeting | Senators scrutinize self-driving car safety | Trump to 'look at' Apple tariff exemption | Progressive lawmakers call for surveillance reforms | House panel advances telecom bills Minority lawmakers call out Google for hiring former Trump DHS official MORE, who assumed her role in 2017, would be leaving her post. 

NBC News reported that a recent push from Trump to renew a family separation policy at the southern border led to Nielsen's ouster.

The White House said the following day that Trump was also removing U.S. Secret Service Director Randolph "Tex" Alles from his position. CNN reported that Trump fired Alles, though Alles has contested that report, saying that he learned "weeks ago" that there would be "transitions in leadership" across the Department of Homeland Security.

A number of high-profile administration officials, including former White House chief of staff John KellyJohn Francis KellyMORE, former Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsLisa Page sues DOJ, FBI over alleged privacy violations Sessions leads GOP Senate primary field in Alabama, internal poll shows Trump rebukes FBI chief Wray over inspector general's Russia inquiry MORE and former Environmental Protection Agency head Scott PruittEdward (Scott) Scott PruittOvernight Energy: Rate of new endangered species listings falls | EPA approves use of 'cyanide bombs' to protect livestock | Watchdog says EPA didn't conduct required analyses EPA didn't conduct required analyses of truck engine rule: internal watchdog Is Big Oil feeling the heat? MORE, have exited their posts in Trump's first two years in office.

Pompeo was confirmed as secretary of State in April 2018, about a month after Trump dismissed his first State Department chief, Rex TillersonRex Wayne TillersonReport: Trump UK ambassador fired deputy for mentioning Obama in speech Overnight Defense: Ex-Navy secretary slams Trump in new op-ed | Impeachment tests Pompeo's ties with Trump | Mexican president rules out US 'intervention' against cartels Pompeo-Trump relationship tested by impeachment inquiry MORE, from the role.