An American Muslim advocacy group urged lawmakers to demand answers regarding a ProPublica investigation published Monday that found Border Patrol agents making racist and sexist postings in a private Facebook group.

The Council on American-Islamic Relations (CAIR) said in a press release Tuesday that members rallied outside the state office of Rep. Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.), the chairman of the House Oversight and Reform Committee, demanding hearings into the Facebook group known as "I'm 10-15," a 9,500-member group that reportedly includes some current and former agents.

The Oversight committee announced earlier Tuesday that it would hold a hearing next week on the treatment of migrant children in the Trump administration's custody, which will reportedly also touch on this issue.

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ProPublica reported this week that members of the group jokingly shared photos of a drowned migrant and his young daughter in the group while other posts referred to undocumented immigrants with racist language.

"Congress must investigate the disturbing reports of racist and sexist views expressed by [Customs and Border Protection] officers to ensure that those views are not turned into discriminatory actions targeting migrants,” CAIR's director of government affairs said in the release.

The agency said Monday that its inspector general would investigate the posts made by current officials in the Facebook group and respond accordingly to any that are found to break agency social media guidelines.

"These posts are completely inappropriate and contrary to the honor and integrity I see — and expect— from our agents day in and day out," Border Patrol chief Carla Provost said Monday.

"Any employees found to have violated our standards of conduct will be held accountable," she added.

Updated July 3 at 7:05 a.m.