A Democratic congressman is pressing the Trump administration on U.S. involvement in two recent high-profile instances of civilian casualties in Yemen.

Rep. Ted Lieu Ted W. LieuThe spin on Woodward's tapes reveals the hypocrisy of Democrats Larry Kudlow defends response to coronavirus: Trump 'led wisely' Lieu on Trump 'playing it down' on coronavirus: 'This is reckless homicide' MORE (D-Calif.) is sending separate letters Tuesday to Secretary of State Mike Pompeo Michael (Mike) Richard PompeoOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Overnight Defense: House Democrats unveil stopgap spending measure to GOP opposition | Bill includes .6B for new subs | Trump issues Iran sanctions after world shrugs at US action at UN Navalny calls on Russia to return clothes he was wearing when he fell ill MORE and acting Defense Secretary Patrick Shanahan Patrick Michael ShanahanHouse Armed Services chairman expresses confidence in Esper amid aircraft carrier coronavirus crisis Boeing pleads for bailout under weight of coronavirus, 737 fallout Esper's chief of staff to depart at end of January MORE about a March airstrike that hit a hospital and an April strike near a school. Combined, the strikes killed about 20 people.

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“Unfortunately, these horrific airstrikes on civilian targets are not isolated incidents, but rather part of a long track record of bombing civilians at markets, weddings, schools, hospitals, funerals and other off-limits sites that have killed over 4,600 civilians since 2015,” Lieu wrote in both letters, obtained by The Hill ahead of their public release.

Lieu’s letters come after Congress passed a resolution to end U.S. military support for the Saudi-led coalition in Yemen’s civil war, sending it to President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s desk for his signature.

Trump is expected to veto the resolution, and Congress is not expected to have enough votes to override the veto.

The United States supports the Saudi coalition’s fight against the Houthi rebels with logistics, intelligence sharing and arms sales.

Until last November, the U.S. military also provided aerial refueling for coalition jets. But the Trump administration halted that support as congressional pressure to end U.S. involvement in the war grew.

In his letter to Shanahan, Lieu asked whether “refueling assistance resumed since the 2018 announcement.”

Lieu also asked whether either the school or hospital was on the no-strike list the United States provides to the coalition and whether the United States provided targeting assistance for either of the two airstrikes.

Lieu further asked whether the Pentagon believes either strike violated the law of armed conflict.

In the letter to Pompeo, Lieu pressed him on a statement he made in March at the National Review Institute's 2019 Ideas Summit that the U.S. role in the war has reduced civilian casualties.

“Factually, frankly, the American role there has reduced civilian casualties there inordinately,” Pompeo said at the summit. “I can show you the statistics. Since America’s begun to assist the Saudis in their campaign, the ratio of civilian casualties to effectiveness has decreased dramatically, and that’s important.”

Lieu asked for the specific statistics Pompeo referred to, as well as what specific U.S. assistance resulted in that decreased ratio.

He also asked Pompeo whether the U.S. has asked the coalition for information on either the hospital strike or school strike and whether the administration believes there needs to be an independent investigation into either strike.

Lieu requested both Shanahan and Pompeo respond within 14 days after the letter is sent.

“Any assistance of the United States in aiding and abetting what look like war crimes harms both our moral standing and our national security,” Lieu wrote in both letters. “We are giving terrorists ample material by our support of a coalition that keeps killing children.”