08:20 AM EDT, 09/02/2025 (MT Newswires) -- US equity futures were lower pre-bell Tuesday as traders looked ahead to economic data amid renewed uncertainties surrounding the country's tariff policy.

Dow Jones Industrial Average futures were 0.6% lower, S&P 500 futures were down 0.8%, and Nasdaq futures were 1% lower.

A federal appeals court ruled on Friday that most tariffs issued by President Donald Trump are illegal.

Oil prices were higher, with front-month global benchmark North Sea Brent crude up 1.6% at $69.24 per barrel and US West Texas Intermediate crude 2.8% higher at $65.78 per barrel.

The Manufacturing Purchasing Managers' Index, scheduled for release at 9:45 am ET, is seen coming in at 53.3 for August, according to estimates compiled by Bloomberg.

The Institute for Supply Management's Manufacturing Purchasing Managers' Index, due at 10 am ET, is seen coming at 49.0 for August versus 48.0 previously. Forecasters see a 0.1% decline in construction spending for July following a 0.4% downtick in June.