President Trump

After a meeting in Kiev between President Petro Poroshenko and NATO's secretary general, the Ukrainian leader pledged reforms aimed at qualifying his country for the western alliance by 2020.

Donald Trump, Jr. gave shifting explanations of a meeting last summer with a Kremlin-linked lawyer, also attended by Trump's then-campaign chairman, Paul J. Manafort, and son-in-law, Jared Kushner.

After a long meeting with Russia's leader, President Trump says, "Now it is time to move forward in working constructively with Russia!"

Noting President Trump's stance, a declaration states, "The leaders of the other G20 members state that the Paris Agreement is irreversible."

The truce, for a section of the country's southwest, also includes Jordan and Israel. Several such cease-fires in the past have been short-lived.

When the two presidents meet Friday, the world will be looking for clues to the future of the fraught U.S.-Russian relationship. "Putin needs the meeting more than Trump," says one Russia expert.

The renowned physicist and cosmologist says the U.S. pulling out of the Paris climate change accord could turn our planet into another Venus.

The president of the United States went after an MSNBC anchor's looks and intellect on Twitter Thursday morning. It prompted immediate pushback even from elected officials of his own party.

The administration is expected to outline how the limited travel ban will work, following the Supreme Court's lifting of stays blocking the executive order.

An NPR/PBS NewsHour/Marist poll finds that independents were willing to give President Trump a chance once he took office, but now they're increasingly dissatisfied with his performance.