At Belweder Palace in Warsaw, Poland: a bust of Jozef Klemens Pilsudski.

President Barack Obama and President Bronislaw Komorowski of Poland participate in a working lunch with Central and Eastern European leaders at the Koniecpolski Palace in Warsaw, Poland, June 3, 2014.

President Barack Obama and President Bronislaw Komorowski of Poland participate in a working lunch with Central and Eastern European leaders at the Koniecpolski Palace in Warsaw, Poland, June 3, 2014.

Raw Video: The President Talks With Young Asthma Patients

At the Children’s National Medical Center in Washington, D.C., President Obama visits with children whose asthma is aggravated by air pollution.

6/2/14: White House Press Briefing

White House Press Briefings are conducted most weekdays from the James S. Brady Press Briefing Room in the West Wing.

President Barack Obama jokes with Environmental Protection Agency Administrator Gina McCarthy and EPA staff members who worked on the power plant emissions standards, in the Rose Garden of the White House, June 2, 2014.

President Barack Obama jokes with Environmental Protection Agency Administrator Gina McCarthy and EPA staff members who worked on the power plant emissions standards, in the Rose Garden of the White House, June 2, 2014.

First Lady Michelle Obama reacts to seeing her initials welded onto a steel plate by welder Michael Macomber during a keel-laying ceremony for the USS Illinois at the General Dynamics Electric Boat Shipyard in North Kingston, R.I., June 2, 2014.

First Lady Michelle Obama reacts to seeing her initials welded onto a steel plate by welder Michael Macomber during a keel-laying ceremony for the USS Illinois at the General Dynamics Electric Boat Shipyard in North Kingston, R.I., June 2, 2014.