Algeria holds presidential elections; U.S. taxpayers mark Tax Day; and Ukraine prepares for talks with Russia, the United States, and the EU.

The Prime Minister of Iraq visits the White House; the Senate Foreign Relations Committee discusses the Iran nuclear deal; and the World Bank and International Monetary Fund hold meetings.

The U.S. Senate may vote on legislation to review the Iran nuclear deal; Nepal recovers from its earthquake; and the UK holds general elections.

The UN Security Council receives a chemical weapons report on Syria; Japanese Prime Minister Shinzo Abe tours the United States and Afghan President Ashraf Ghani visits India.

The chemical weapons crisis continues to unfold in Syria, U.S. Secretary of State Rex Tillerson visits Moscow, and NATO Secretary-General Jens Stoltenberg meets President Donald J. Trump.