Stock futures were falling early Monday as markets were roiled by threats of new levies but also confusion over the deadline for the proposed duties. S&P 500 futures were falling 0.5% and Nasdaq 100 futures were dropping 0.6%. Trump said “tariff letters and/or deals” will be delivered starting Monday and threatened an additional levy on countries aligned with the Brics group–which includes Brazil, Russia, India and China–in a post on Truth Social overnight.