Alarm mounted throughout the summer as researchers at leading AI labs found the pace of development far outstripping their expectations.

The promise would likely cost more than $1 trillion and require congressional approval, and would further exacerbate the country's nearly $1.8-trillion annual budget deficit and concerns about inflation.

Ottawa's latest measures are a response to tariffs imposed by President Trump last month on Canadian exports.

The president, who won reelection based on a promise to turn the economy around, now faces a reckoning in midterms centered largely on his economic record.

Trump's White House ballroom will be built with mostly private funds and without approval of Congress.