Several senators pressed the Trump administration on Friday for details after reports that U.S. officials tried to get Twitter to unmask an anonymous account that published tweets critical of President Trump.

“I am gravely alarmed by the summons that U.S. Customs and Border Protection (CBP) transmitted to Twitter on March 14, 2017, regarding the Twitter account @ALT_USCIS," Sen. Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.) wrote in a letter to federal officials.

"Not only was the summons blatantly inconsistent with the cited investigatory authority … it appeared to be a distributing threat to free speech and whistleblower protections,” he added.

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Sens. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) and Cory Gardner Cory Scott GardnerHouse approves bill to secure internet-connected federal devices against cyber threats Congress needs to finalize space weather bill as solar storms pose heightened threat Trump courts Florida voters with moratorium on offshore drilling MORE (R-Colo.) sent a separate letter on Friday to Homeland Security Secretary John Kelly inquiring about the administration’s alleged attempts to gain information on the anonymous Twitter.

The senators asked Kelly for details into what sorts of actions CBP and the Department of Homeland Security took regarding the account and noted their concern for potential violations of free speech.

Twitter filed a lawsuit against the government on Thursday in response to the administration’s attempts to unmask a CBP parody account.

Twitter then dropped the suit on Friday after the CBP withdrew its summons regarding the account, according to Twitter lawyers.

Wyden requested that Kevin McAleenan, acting commissioner of U.S. Citizenship and Immigration Services (USCIS), to investigate the matter further.

The Democratic senator said the Trump administration's effort may have violated the “First Amendment right to comment on U.S. policy, and to make those comments anonymously."