US stocks sold off into the close on Monday as investors weighed the prospects of President Donald Trump's tariff policies and also shifted focus to this week's Nvidia ( NVDA ) earnings.

The Dow Jones Industrial Average ( ^DJI ) was little changed on the heels of its worst week since October. The S&P 500 ( ^GSPC ) fell 0.5%, while the tech-heavy Nasdaq Composite ( ^IXIC ) fell 1.2%.

Stocks' comeback attempt fizzled after Friday's steep declines capped a losing week, which was marked by data showing American consumers and businesses are becoming concerned about Trump's tariff plans .

During a press conference on Monday, President Donald Trump suggested tariffs on Mexico and Canada would "go forward on time, on schedule," once a month-long delay is over next week.

Meanwhile, how Nvidia is navigating the looming threat of those tariffs will be closely watched when the AI chipmaker reports its results on Wednesday — the highlight of the earnings week . Eyes are also on Big Tech's demand for AI and risks from China-based DeepSeek's lower-cost tech.

Nvidia fell 3% while Microsoft ( MSFT ) lost ground after an analyst report that it is pulling back on data center construction . But Apple's ( AAPL ) stock tipped higher after it pledged to spend and invest $500 billion in the US.

Other key events this week include the January report for the Personal Consumption Expenditure (PCE) index on Friday. The PCE index is the Federal Reserve's preferred measure of inflation. Reports on US GDP, the housing market, and consumer confidence are also due in the coming days.