Back in 2015, networking equipment vendor Juniper Networks discovered unauthorized code in its software that created a backdoor, potentially allowing hackers to decrypt and spy on supposedly secure traffic. Now, officials want answers. A group of 13 senators has sent an open letter to the company, calling for the results of its internal investigation to be published.

“It has now been over four years since Juniper announced it was conducting an investigation, but your company has still not revealed what, if anything, it uncovered,” the letter says. It goes on to outline a number of requests for specific information, such as who led the company’s investigation, why its findings weren’t published as originally promised, and what was ultimately done to remedy the vulnerability. The group has asked for a response from Juniper by July 10th.

Earlier this week, AWS vice president Tim Bray quit over what he sees is an attempt to punish whistleblowers who express concerns about lacking COVID-19 protections. Meanwhile, the National Labor Relations Board is looking into claims of retaliation against employees who organize or participate in protests.

In a statement provided to Engadget, an Amazon spokesperson said:

“These individuals were not terminated for talking publicly about working conditions or safety, but rather, for violating—often repeatedly—policies, such as intimidation, physical distancing and more. We support every employees’ right to criticize or protest their employer’s working conditions, but that does not come with blanket immunity against any and all internal policies. We look forward to explaining in more detail in our response to the Senators’ letter.”

Amazon has responded to criticism around its coronavirus response with a pledge to provide masks and conduct temperature scans, and CEO Jeff Bezos said the company will spend $4 billion on COVID-19 related expenses, including “keeping employees safe.” But Amazon is facing pressure abroad too, and it is being questioned regarding alleged data abuse.

As The Verge notes, in the past, Amazon has justified firing outspoken employees with vague claims that they violated internal policies. But with increased pressure on several fronts and big names like Sanders and Warren behind this letter, Amazon may have to offer a more in depth explanation.

Update 5/7/2020 3:05PM ET: This story was updated to include a statement from Amazon.

In a statement, Schumer said, “These videos sure do make you chuckle; they’re creative. But China might be laughing at these TSA postings for very different reasons, and that should concern us and it’s why I am urging the TSA to find a different platform, and cease its use of TikTok now.” On Sunday, the TSA said that a “small number of TSA employees have previously used TikTok on their personal devices to create videos for use in TSA’s social media outreach, but that practice has since been discontinued.”

The move follows similar decisions by other government organizations concerned about security threats associated with the app. Back in October 2019, senators began questioning the use of the app in government capacities, stating that “TikTok is a potential counterintelligence threat we cannot ignore.”

Since then, the US Army, Marines, Navy, and subsequently the Air Force and Coast Guard have all confirmed hard line restrictions on the app. TikTok’s parent company ByteDance hasn’t commented on any of these decisions individually, but maintains that “TikTok is committed to being a trusted and responsible corporate citizen in the US, which includes working with Congress and all relevant regulatory agencies.”

In May, the FCC rejected China Mobile’s application to become a telecom provider in the US, citing “substantial and serious” law enforcement and security risks. In their letter, the Senators reportedly warn that China Telecom and China Unicom could pose similar threats and could reroute communications traveling on their networks through China. When the FCC denied China Mobile’s application, it said it was reviewing existing approvals. In a statement provided to Reuters, FCC spokesperson said Chairman Ajit Pai “has made it clear that the Commission is reviewing other Chinese communications companies such as China Telecom and China Unicom.”

While the FCC may already be investigating the two telecoms, the letter shows that Congress is willing to apply pressure to Chinese technology firms, even as the Trump administration lifts some restrictions on companies like Huawei.