World financial leaders gathered in Washington on Thursday with pledges to work with U.S. President Donald Trump to fix lingering trade problems while vowing to keep their commitments to free trade and global integration.

Worries over Trump’s approach to trade, taxes, financial regulation and climate change clouded the start of the International Monetary Fund and World Bank spring meetings, even amid improved optimism over global growth prospects.

As the meetings got started, two blocks away at the White House, Trump signed a directive to study whether steel imports into the United States could be restricted for national security reasons under a law passed in 1962.

Such moves, including a review of “Buy American” rules launched earlier this week, have raised concerns that the United States is looking outside the World Trade Organization for remedies to restrict U.S. imports.

IMF Managing Director Christine Lagarde said she would work with the Trump