WASHINGTON—Kirstjen Nielsen resigned as secretary of the Department of Homeland Security, President Donald Trump announced Sunday. In a tweet, the president named Kevin McAleenan, previously the U.S. Customs and Border Protection commissioner, acting secretary of homeland security. Nielsen replaced Gen. John Kelly as secretary in December 2017 after he became the president’s chief of staff.

WASHINGTON—The House of Representatives will mount a legal challenge against President Donald Trump’s declaration of a national emergency at the U.S. southern border, House Speaker Nancy Pelosi, D-Calif., announced Thursday. The Bipartisan Legal Advisory Group, consisting of the top House leaders, voted along party lines to authorize the lawsuit. Democrats say the president exceeded his authority by declaring a national emergency to get access to more money for security at the U.S.-Mexico border than Congress authorized.

WASHINGTON—Republicans are trying to gather enough signatures to bypass House Democratic leadership and vote to protect babies born during attempted abortions.

House Minority Whip Steve Scalise, R-La., introduced a discharge petition Tuesday for the Born-Alive Abortion Survivors Protection Act, a measure that would mandate that babies who survive attempted abortions receive medical care. Providers who failed to care for those babies would face criminal and civil penalties.

WASHINGTON—The House approved a measure Thursday to cut off U.S. support for Saudi involvement in Yemen’s civil war, breaking with President Donald Trump’s foreign policy and setting up another possible presidential veto. The War Powers resolution passed by a 247-176 vote, with 16 Republicans joining their colleagues across the aisle. The measure passed in the Senate in March with a 54-46 bipartisan vote.

WASHINGTON—House Democrats have asked the Internal Revenue Service for six years of President Donald Trump’s tax returns. House Ways and Means Committee Chairman Richard Neal, D-Mass., on Wednesday requested that IRS Commissioner Charles Rettig release Trump’s returns from 2013 to 2018. Under tax code provision No.

WASHINGTON—After changing Senate rules Wednesday, Republicans are countering criticism that the move represents a troubling trend toward weakening the power of the minority party in Congress. The Senate voted 51-48 Wednesday to limit debate on nominations for lower-level federal courts and executive appointments, a change that will speed confirmation of President Donald Trump’s nominees. The new rules allow a simple majority in the Senate to break a filibuster of a nominee’s confirmation after two hours instead of 30.

UPDATE: The U.S. Senate voted 51-48 Wednesday to limit debate on nominations for lower-level federal judgeships and executive appointments, a change that will speed confirmation of President Donald Trump’s nominees. The rules will allow a simple majority in the Senate to break a filibuster of a nominee’s confirmation after two hours instead of 30. The change will not apply to White House appointees to the Cabinet, Supreme Court, or appellate courts. Every Democrat opposed the measure, and Republican Sens.