WASHINGTON, July 28 (Reuters) - The U.S. trade deficit in goods narrowed in June amid a decline in imports, but the improvement was probably insufficient to prevent trade from again subtracting from economic growth in the second quarter.

The goods trade gap contracted 4.2% to $101.5 billion last month, the Commerce Department's Census Bureau said on Tuesday. Economists polled by Reuters had forecast the goods deficit at $100.0 billion.

Goods imports decreased $8.2 billion to $306.2 billion, but remaining elevated amid an artificial intelligence spending boom. The AI build-out is heavily dependent on imports. Exports of goods fell $3.8 billion to $204.7 billion. 

The government is scheduled to publish its advance estimate of second-quarter gross domestic product growth on Thursday. A Reuters survey of economists estimates the economy grew at a 2.1% annualized rate last quarter, which would match the first quarter's pace.

Trade has subtracted from GDP for two straight quarters. Business spending on equipment, mostly reflecting AI investment, is expected to have been a key source of growth last quarter.