President Donald Trump extended his "Liberation Day" tariff pause and sent letters to trading partners announcing new tariff rates for Aug. 1.

US President Donald Trump has announced that all imports from Canada will have a 35% tariff as of August 1. He sent a letter to the country’s president, Mark Carney, informing him of the new rate, which has also been posted on his Truth Social account.

Brazilian President Luiz Inácio Lula da Silva said Wednesday that the 50% tariffs announced by U.S. President Donald Trump would trigger the country's economic reciprocity law.

The Dow, S&P 500 and Nasdaq remain volatile as trade deals and tariffs keep investors in limbo. Amazon’s Prime Day met with fierce competition as Walmart, Costco offer their own deals. Oil inches higher.

The Trump administration is expected to send dozens of letters to countries that have not made a trade deal, warning them that higher tariffs could kick in next month.

"America will, once again, build a DOMINANT Copper Industry," Trump said in a post on his Truth Social media platform.

NBC News is tracking the prices of common purchases ahead of major discounting by Amazon, Walmart and other retailers, and as Trump’s global levies threaten to take hold.

U.S. stock futures edged lower and global equities were narrowly mixed with sector-specific duties back in the spotlight.