Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (N.J.), the top Democrat on the Senate Foreign Relations Committee, called for an “immediate briefing” from the administration on communications released by House Democrats on Tuesday suggesting former Ambassador to Ukraine Marie Yovanovitch Marie YovanovitchGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Strzok: Trump behaving like an authoritarian Powell backs Biden at convention as Democrats rip Trump on security MORE was under surveillance by Trump associates before her removal.

“These disturbing messages indicate that Ambassador Yovanovitch’s movements may have been closely tracked, for at a minimum, over a series of days in late March 2019. Notably, this was the same time frame that a packet of disinformation, the contents of which smeared Ambassador Yovanovitch, made its way into the hands of senior officials at the State Department, including the Secretary, and as a series of articles were published that made false attacks against her,” Menendez wrote in a letter to Assistant Secretary of State Michael Evanoff.

In the records released by lawmakers on Tuesday, Republican congressional candidate Robert Hyde texted Lev Parnas, an associate of President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's personal attorney Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE who was indicted last year, “Wow. Can’t believe Trumo hasn’t fired this bitch. I’ll get right in that” in reference to Yovanovitch.

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Hyde suggested in the communications that Yovanovitch's movements were being monitored, texting Parnas, “They will let me know when she’s on the move.”

“I demand an immediate briefing and accounting by you and all relevant officials about what the Department knew about any of these efforts to track Ambassador Yovanovitch’s whereabouts while she served in Kyiv, including Embassy officials and the Regional Security Officer at post; what steps the Department took at the time to ensure her safety; and the steps it has taken since then to ensure her safety and the safety of all U.S. personnel stationed in Kyiv,” Menendez wrote.

The Hill has reached out to the State Department for comment.

The messages, which also detail Parnas's role in trying to pressure the Ukrainian government to open investigations that would be beneficial to Trump, have been seized on by Democrats who say they "dramatically underscore" the need to admit new witnesses and documents in Trump's impeachment trial.

In the letter, Menendez also claimed the State Department had yet to address concerns he raised in two letters sent in November regarding potential risks to the safety of diplomats who testified before Congress in the House’s impeachment hearings, calling the lack of response “disturbing.”

“I trust that you will treat this request with utmost urgency, and swiftly respond to this as well as my prior requests regarding the safety and security of Department employees,” he wrote.