Rep. Ted Lieu (D-Calif.) on Monday asked members of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's Cabinet to lower the flags outside their respective department buildings to half staff to honor the late Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.) after White House flags returned to full staff.

Lieu tweeted the same message at three Cabinet officials who served in the military: Secretary of Defense James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE, Secretary of State Mike Pompeo Michael (Mike) Richard PompeoPutin nominated for Nobel Peace Prize The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Pompeo accused of stumping for Trump ahead of election MORE and Interior Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE.

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"You served on active duty. As a nation mourns McCain, it would be appropriate to lower the flag to half staff at all @StateDept buildings. I respectfully request you give that order, regardless of the views of @realDonaldTrump. It is the honorable thing to do," Lieu tweeted, sending a separate message to each Cabinet official.

Dear @SecPompeo: You served on active duty. As a nation mourns McCain, it would be appropriate to lower the flag to half staff at all @StateDept buildings. I respectfully request you give that order, regardless of the views of @realDonaldTrump. It is the honorable thing to do. https://t.co/yIllKANhMq — Ted Lieu (@tedlieu) August 27, 2018

Dear @SecretaryZinke: You served on active duty. As a nation mourns McCain, it would be appropriate to lower the flag to half staff at all @Interior buildings. I respectfully request you give that order, regardless of the views of @realDonaldTrump. It is the honorable thing to do https://t.co/HnxooCDRfP — Ted Lieu (@tedlieu) August 27, 2018

Dear #SecDef: You served on active duty. As a nation mourns McCain, it would be appropriate to lower the flag to half staff at all @DeptofDefense buildings. I respectfully request you give that order, regardless of the views of @realDonaldTrump. It is the honorable thing to do. https://t.co/KSHnUuYPPc — Ted Lieu (@tedlieu) August 27, 2018

Flags at the White House returned to full staff early Monday, less than 48 hours after McCain died.

Several reporters and commentators quickly noted that flags in the past have remained lowered to honor lawmakers and major public figures until their funerals.

Joe Heim, a Washington Post reporter, posted a photo on Twitter showing that the flag outside the Department of Energy remained at half staff on Monday morning, while the flag just down the road at the Department of Agriculture was back at full staff.

Even the cabinet is closed confused about honoring McCain. Flag at Energy is half staff. At Agriculture, across the street, flag is at full staff. pic.twitter.com/gs0fr85kcr — Joe Heim (@JoeHeim) August 27, 2018

McCain died Saturday at age 81 a little more than a year after being diagnosed with an aggressive form of brain cancer. Even after his diagnosis, he remained one of Trump's most outspoken Republican critics.

McCain reportedly did not want Trump to attend his funeral, instead requesting that former Presidents Obama and George W. Bush deliver eulogies.

During the 2016 campaign, Trump ridiculed McCain's status as a war hero. In recent months, Trump has regularly chided McCain over his decision to vote against a GOP effort to repeal the Affordable Care Act, effectively killing the measure.

Trump reportedly nixed a draft statement from the White House calling McCain a "hero" after the senator's death. Trump instead issued a tweet offering his sympathies to McCain's family.

A number of other administration officials issued their own statements via Twitter, including Pompeo, Vice President Pence, White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE and Trump's attorney, Rudy Giuliani.

McCain, a former naval aviator, is scheduled to lie in the Arizona Capitol on Wednesday and then the U.S. Capitol on Friday. He will be buried at the U.S. Naval Academy in Annapolis, Md., on Sunday.