Rep.-elect Joe Cunningham Joseph CunninghamKate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House Warning signs flash for Lindsey Graham in South Carolina Trump asked Chamber of Commerce to reconsider Democratic endorsements: report MORE (D-S.C.) on Sunday mocked 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 for referring to himself as "President T" in a tweet in which he thanked himself for dropping oil prices.

"Just changed Boone’s diaper (thank you Congressman C)," Cunningham, who won a seat in the House of Representatives earlier this month, tweeted.

Just changed Boone’s diaper (thank you Congressman C). https://t.co/opRsg2Zxn3 — Joe Cunningham (@JoeCunninghamSC) November 26, 2018

Trump on Sunday nicknamed himself "President T" in an early-morning tweet in which he lauded his work to reduce oil prices.

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“So great that oil prices are falling (thank you President T),” the president wrote. “Add that, which is like a big Tax Cut, to our other good Economic news. Inflation down (are you listening Fed)!”

The message came only days after he praised Saudi Arabia for the falling price of oil, before urging that the prices "go lower!"

Trump's relationship with Saudi Arabia has received heightened scrutiny in recent days. He said last week that the U.S. would seek to maintain a "steadfast" alliance with the kingdom despite its role in the killing of journalist and U.S. resident Jamal Khashoggi.

Trump also refused to blame Saudi Crown Prince Mohammed bin Salman for the killing, even as reports emerged that the CIA has concluded that bin Salman likely ordered the assassination.

Khashoggi was killed after entering the Saudi consulate in Istanbul on Oct. 2.

Cunningham won his bid to represent South Carolina's 1st Congressional District earlier this month. He beat Republican state Rep. Katie Arrington to earn the seat that was left vacant after GOP Rep. Mark Sanford lost his primary.