The 10 Democrats on the Senate Foreign Relations Committee sent a lengthy letter Wednesday to Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE demanding that he end a hiring freeze at the State Department and explain his plan to restructure the agency to Congress.

In a lengthy letter to Tillerson, the group of senators, led by ranking member Ben Cardin Benjamin (Ben) Louis CardinCongress must finish work on popular conservation bill before time runs out PPP application window closes after coronavirus talks deadlock Congress eyes tighter restrictions on next round of small business help MORE (Md.) blasted Tillerson for making the changes to the department "largely behind closed doors."

"The department’s redesign, spending, and personnel moves are taking place largely behind closed doors and without the level of transparency we would expect," the letter reads. "Moreover, proposals that have come to light lead us to question whether the intended result is in fact a more efficient department that continues to serve the interests of the American people and promote our foreign policy objectives abroad."

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The State Department has seen drastic departure numbers since Tillerson took office under President Trump earlier this year, and has left multiple key positions unfilled.

Career diplomats have left State in droves, and those who remain have reported terrible morale and the lack of a clear mission.

On Wednesday, senators pressed Tillerson over the vacancies and reports of senior staff being relegated to clerical duties due to staff shortages.

"It is unclear whether these posts are unfilled by design or dysfunction; either way it is deeply troubling," the senators write. "We cannot confirm nominees who have not been nominated."

The hiring freeze, which Tillerson decided to institute in April, should be ended, according to the senators, "given the uncertain timeline of the reorganization and the ongoing detrimental effects the freeze is having" on agency morale.

"We think that attrition as a strategy for managing a workforce is problematic because it does not allow management to control for the skills, experience, and workforces that it actually needs. When dealing with national security, the potential costs of such a mismatch can be fatal," the senators said.

The letter concludes by warning Tillerson that the lawmakers are exploring "legislative options to address these concerns."

The Democrats' letter Wednesday echoes complaints from Republican Sen. John McCain John Sidney McCainCindy McCain endorses Biden: He's only candidate 'who stands up for our values' Biden says Cindy McCain will endorse him Biden's six best bets in 2016 Trump states MORE (Ariz.) who called on Tillerson to end the hiring freeze last month.

"We know from experience that shutting off the intake of entry-level Foreign Service officers will inevitably result in shortages of appropriately experienced personnel at specific grades in future years," McCain wrote alongside Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.) last month.