US equity investors will mainly focus on tariffs and Nvidia's (NVDA) earnings this week while keeping an eye on geopolitical developments in Iran and the domestic producer price inflation data.

* Following the Supreme Court ruling on Friday, the Trump Administration plans to invoke Section 122 of the 1974 Trade Act, which allows tariffs of up to 15% for as long as 150 days.

* China called on the US to comply with the Court's ruling and abandon unilateral trade tariffs, in a prepared statement issued Monday. Meanwhile, India and Washington have reportedly decided to reschedule a meeting over the interim bilateral trade agreement.

* However, the European Commission reportedly called Sunday for Washington to abide by the terms of the trade deal struck last year with the European Union. "A deal is a deal."

* Single, punitive import rates are no longer an option for Trump, Rystad Energy said late Friday. "The stick is now the same size for everyone, and it is a little smaller," the note said. "The current result of the Supreme Court's ruling is not a reversal of protectionism, but a narrower, more legally constrained US tariff regime."

* The Wells Fargo Investment Institute said late Friday, "lower-court distribution of refunds will take time." Positive forces such as subdued inflation and fiscal stimulus are laying the groundwork for a "constructive economic backdrop."

* Quarterly earnings due this week include Nvidia, Home Depot (HD), Constellation Energy (CEG), and The TJX Companies (TJX). Nvidia's results will be closely watched, given the recent underperformance of the technology sector.

* Trump's State of the Union address, producer price inflation, jobless claims, and speeches from Federal Reserve heavyweights, including Governor Christopher Waller, will be closely monitored this week.

* Iran announced Saturday it is drafting a proposal, expected within the next 48 to 72 hours, aimed at breaking the deadlock with the US, the Indian Express reported.