National Business

CALGARY — An American activist investor trying to force change at TransAlta Corp. has launched a lawsuit to try to derail the power utility's $750-million partnership deal with Brookfield Renewable Partners.

TORONTO — Three of North America's stock markets closed at all-time highs Tuesday after getting lifts from strong U.S. corporate results and higher crude oil prices.

OTTAWA — Bank of Canada governor Stephen Poloz will give his updated outlook for the economy Wednesday in an appearance that many expect will send stronger signals the interest rate will be on hold for months.

Some of the most active companies traded Tuesday on the Toronto Stock Exchange: Toronto Stock Exchange (16,669.40, up 92.12 points ). Encana Corp. (TSX:ECA). Energy. Up 26 cents, or 2.61 per cent, to $10.24 on 10.6 million shares. Bombardier Inc.

WASHINGTON — President Donald Trump finally has a date on the calendar for a state dinner at Buckingham Palace — a visit more than two years in the making.

GATINEAU, Que. — Canada's anti-spam law is being used against a former CEO who is accused of using several businesses operating under names such as Teambuy and Dealfind to bombard consumers with emailed discount coupon offers.

VANCOUVER — Teck Resources Ltd. says it is less exposed to uncertainties on Chinese coal imports after shifting more sales to India.

LONDON — Ian McEwan is fascinated by artificial intelligence. His new novel, "Machines Like Me," features a lifelike android with access to all human knowledge who writes haiku poetry. In real life, the Booker Prize-winning author is conflicted.

SAN FRANCISCO — Twitter Inc. on Tuesday trumpeted strong quarterly growth in earnings and users while President Donald Trump tweeted criticism of the social media site for allegedly discriminating against him politically.

WASHINGTON — Sales of new U.S. homes increased 4.5% in March, the third straight monthly gain as the housing market appears to be cautiously recovering from a mortgage rate spike last year that caused homebuying to slump.