In the investigation published Wednesday, a CNN team witnessed soldiers from neighboring Eritrea, some disguising themselves in old Ethiopian military uniforms, manning checkpoints in Tigray, obstructing and occupying critical aid routes, and roaming the halls of one of the region’s few operating hospitals and threatening medical staff.

Following the publication of CNN’s investigation, the United Nations confirmed Wednesday that the “blockades by military forces” had severely impeded the ability for assistance to reach rural areas where the humanitarian crisis is worst.

Texas Rep. Michael McCaul told CNN on Thursday that “there have been ample, credible reports from human rights groups and journalists on the continuing presence of Eritrean troops, and reports that have implicated them, and other armed actors, in human rights abuses, rape and other atrocities.”

“It is clear that the Government of Ethiopia and the Government of Eritrea have not upheld their public commitment to withdraw Eritrean forces out of Tigray. Now we have this on-camera evidence from CNN.”

McCaul and Rep. Gregory Meeks, the New York Democrat who’s chair of the House Foreign Affairs Committee, have been leading a continued push for the Biden administration to “urgently use all available tools, including sanctions and other restrictive measures, to hold all perpetrators accountable and bring an end to this conflict.”

He has spoken several times with Abiy about the crisis, most recently last month to press Ethiopia and Eritrea to make good on commitments to withdraw Eritrean troops “immediately, in full and in a verifiable manner.”

Amid the humanitarian crisis, the State Department dispatched its special envoy for the Horn of Africa, Jeff Feltman, to the region this month. Feltman traveled to Egypt, Eritrea, Ethiopia and Sudan in early May, meeting with government officials, the UN and the African Union. He is scheduled to brief the Senate Foreign Relations Committee behind closed doors next week.

The US has sent millions in additional funds to Tigray to assist in responding to the humanitarian crisis and has deployed a US Agency for International Development disaster assistance response team to the region.