US equity indexes were mixed midday Tuesday, with communication services and consumer discretionary sectors emerging as top gainers, a day before the Trump administration announces a new slate of reciprocal tariff.

The Nasdaq Composite rose 0.9% to 17,460.2, with the S&P 500 0.5% up at 5,637.4 and the Dow Jones Industrial Average 0.2% down at 41,934.5. The three indexes traded mixed earlier in the session. Communication services and consumer discretionary led the gainers intraday. Real estate and healthcare were the worst performers.

A growing bipartisan cohort of US senators is poised to challenge the White House's justification for imposing tariffs on Canadian goods, in what could be the most significant Republican rebuke to President Donald Trump's second term, The Globe and Mail reported Tuesday.

The news report said that senators are expected to cast their votes on Tuesday on a resolution in the Republican-controlled chamber seeking to terminate the national emergency the White House declared over illicit fentanyl flowing from Canada into US territory. Sen. Susan Collins', R-Maine, office confirmed to the newspaper on Tuesday morning that she would support the resolution introduced by Sen. Tim Kaine, D-Virginia.

Treasury Secretary Scott Bessent told Fox News on Monday that the tariff announcement would be at 3 p.m. ET Wednesday. The Wall Street Journal reported Monday that Trump's advisers, in recent days, were considering implementing tariffs of up to 20% on virtually all trading partners, while a narrower plan involving reciprocal tariffs is still on the table.

Meanwhile, in economic news, job openings fell to 7.568 million in February, the US Bureau of Labor Statistics said in a report. The print lagged the 7.655 million expected in a survey compiled by Bloomberg and down from 7.762 million in January. The February level represents 4.5% of total employment, down from 4.7% in January and 5.1% a year earlier.

The Institute for Supply Management said its Purchasing Managers Index for manufacturing fell to 49 in March from 50.3, a touch weaker than the 49.5 consensus.

Gold futures shed 0.3% to $3,139 after making a fresh intraday all-time high of $3,177.00.

Most US Treasury yields fell intraday, with the 10-year yield down 8.4 basis points to 4.16% and the two-year rate 5.1 basis points lower at 3.86%.

West Texas Intermediate crude oil futures climbed 0.3% to $71.66 a barrel.