A key measure of U.S. consumer prices rose by less than expected in April on lower used-car and apparel costs, testing the Federal Reserve’s message that muted inflation will prove transitory while giving President Donald Trump more ammunition to argue for an interest-rate cut.

Federal Reserve Chairman Jerome Powell’s assertion that too-low U.S. inflation will prove transitory hinges largely on what Americans pay for two basic needs: clothing and shelter.

Economists are skeptical that the unexpectedly fast U.S. growth from the first quarter will be sustained for the rest of the year, even as they boosted full-year forecasts to reflect the strong early performance.

President Donald Trump’s fresh tariffs on Chinese goods are likely to weigh on a U.S. expansion already set to slow and further scramble readings from key economic indicators.

U.S. consumer debt growth eased in March with the smallest increase in nine months, suggesting Americans were less motivated to spend despite the strong labor market.

Escalating tariffs on Chinese goods could push U.S. businesses to pass on these higher costs to consumers, said Atlanta Fed President Raphael Bostic, hours before a deadline set by President Donald Trump to raise them to 25% from 10% on $200 billion of products.