Consumers may be opening up their wallets wide right now, but a long-time Wall Street researcher warns strong spending is on borrowed time.

DataTrek Research co-founder Nicholas Colas predicts it’s on the verge of dangerously weakening due to tariff risks — a situation that could ultimately push stocks much lower.

“That trade war issue … really is top of mind for me,” he said this week on CNBC’s “Trading Nation.”

Colas cites low unemployment as the main reason why Americans have felt so good about spending money. The latest monthly reading put the…