US equity futures were lower pre-bell Monday as traders digested a Supreme Court decision on President Donald Trump's tariff program.

Dow Jones Industrial Average futures were 0.5% lower, S&P 500 futures were down 0.5%, and Nasdaq futures were 0.6% lower.

The ruling, issued Friday, found that the Trump administration exceeded certain constitutional limits in parts of its trade and tariff actions.

Oil prices were higher, with front-month global benchmark North Sea Brent crude up 0.2% at $71.46 per barrel and US West Texas Intermediate crude 0.3% higher at $66.66 per barrel.

The January Chicago Fed National Activity Index, scheduled for release at 8:30 am ET, is expected to come in at negative 0.08, compared with negative 0.04 in the prior month, according to estimates compiled by Bloomberg.

The December factory orders bulletin, due at 10 am ET, is expected to show a 0.6% decline following a 2.7% rise in the prior month.