Sen. Tom Carper Thomas (Tom) Richard CarperDemocrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (D-Del.) on Friday issued a second request to the Pentagon for information on the extent of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's cellphone security.

In a letter penned to Defense Secretary James Mattis, Carper voiced concern about the lack of clarity regarding the security of Trump's smartphone usage.

Trump, Carper wrote, "continues to deviate from long-established diplomatic protocols and security measures concerning his external smartphone communications."

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Carper went on to express concern over conflicting reports detailing the security of the president's device.

"Despite prior reports suggesting that President Trump was using a 'secure encrypted device approved by the U.S. Secret Service,' subsequent reports indicated that the President was still using an 'old, unsecured Android phone,' " Carper wrote.

"This security lapse is all the more concerning in light of reports that President Trump has urged world leaders to contact him directly through his smartphone and that White House Chief of Staff John Kelly John Francis KellyMORE’s personal smartphone was compromised for months," he continued.

The senator sent a similar letter in February 2017 — a letter, Carper's office says, to which Mattis has yet to respond.

Carper's request comes amid heightened tensions surrounding cybersecurity within the administration.

Last month, two House Democrats — Reps. Ted Lieu (Calif.) and Ruben Gallego Ruben GallegoHispanic caucus report takes stock of accomplishments with eye toward 2021 Senators call on Pentagon to reinstate funding for Stars and Stripes newspaper Hispanic Caucus campaign chief to mount leadership bid MORE (Ariz.) — sent a similar request to high-ranking White House officials demanding answers from the Trump administration on steps being taken to prevent Trump from being hacked by foreign entities.

“While cybersecurity is a universal concern, the President of the United States stands alone as the single-most valuable intelligence target on the planet,” the congressmen wrote.

“Our national security should not depend on whether the President clicks on a malicious link on Twitter or his text application, or the fortuity of foreign agencies not knowing his personal cell number,” they added.

When Trump first entered the White House last year, he was reportedly using an unsecured Android phone, which he later replaced with a secured iPhone.

An avid Twitter user, it's unclear when exactly the president ceased using his old phone for social media purposes.