The visit by Representatives Don Bacon of Nebraska and Ro Khanna of California is aimed at tamping down tensions stoked by President Trump on trade and immigration.

Republican leaders said they were ready to vote as soon as this month on punishing penalties against Moscow but have paused after President Trump threatened to act unilaterally within weeks.

© Nanna Heitmann for The New York Times

After years pressing to end U.S. aid to Ukraine, many Republicans have abandoned that position now that President Trump is supporting the country against Russian aggression.

© Eric Lee/The New York Times

After years pressing to end U.S. aid to Ukraine, many Republicans have abandoned that position now that President Trump is supporting the country against Russian aggression.

© Eric Lee/The New York Times

The right-wing congresswoman from Georgia suggested that the president’s new proposal to help speed weapons to Ukraine betrays the promise to voters to end U.S. involvement in foreign conflicts.

© Kenny Holston/The New York Times

Momentum has been building behind a bipartisan bill to impose sanctions on countries that purchase Russian oil, as Republicans work behind the scenes to win President Trump’s support.

© Reuters

Momentum has been building behind a bipartisan bill to impose sanctions on countries that purchase Russian oil, as Republicans work behind the scenes to win President Trump’s support.

© Reuters