The Congressional Black Caucus is demanding an apology after "reprehensible" and "blatant lies" were spewed about Florida Representative Frederica Wilson from the White House podium.
The chief of staff had said the congresswoman once claimed to have secured funding for the facility.
"Every time I hear people compare this to Benghazi, it makes me physically sick," Oklahoma Senator James Inhofe said.
The Florida congresswoman struck back at General John Kelly calling her an "empty barrel," saying the attack is racist.
Lawmakers, including John McCain, have criticized the Trump administration for not revealing details about the mission or the killings.
"The president opened this door," Fox News anchor Bret Baier said.
Militant groups including ISIS and Al-Qaeda are active across Africa.
It remains to be seen if there is a domestic U.S. reaction, and what impact that may have on AFRICOM's mission.
The U.S. soldiers were on a training mission with allies from Niger.
The military capability of the militant herdsmen has become increasingly sophisticated.
If vigilantes are going to continue the fight against radical Islamists, they must operate within the law.
The group's use of children has increased by 200 percent.
The violence of ISIS and Al-Qaeda affiliates threatens to spread far beyond Nigeria and Somalia.
No group has yet claimed responsibility for the attack.