US Trade Representative Jamieson Greer is set to meet House Republicans on Wednesday, as President Donald Trump's tariff dispute with Canada increasingly features in domestic political debate. The talks come amid rising tension between Washington and Ottawa, with Trump accusing Ontario of exploiting American businesses and insisting Canada wants preferential treatment without accepting the obligations of statehood.

The US imposed 50% tariffs on a range of Canadian goods in late July, which took effect this month, prompting Canada to retaliate with tariffs of up to 50% on US imports. Trump has further inflamed relations by signing an executive order to rename Lake Ontario "Lake America". Sources say lawmakers are expected to raise the trade war at the Republican Study Committee's weekly lunch, and the issue has already caused divisions within Trump's own party — a House bill to reverse the earlier Canada tariffs passed in February with support from six Republicans.