Ms Clarke has campaigned on the issue

Trump made the change last weekend as part of a wider decision raising border taxes on goods from China by 10% on 4 February.His revision to the order on Friday said tariff-free treatment for packages from China worth less than $800 would remain in place until "adequate systems are in place to fully and expediently process and collect tariff revenue".

The move comes as some of the other rapid-fire changes Trump has announced since taking office last month have also met with roadblocks, including legal challenges.Last weekend he said he was putting 25% tariffs on goods from Mexico and Canada, before rapidly suspending those duties for a month to allow talks to continue.On Friday, Trump said he expected to announce "reciprocal tariffs" on many countries next week, a plan he had outlined on the campaign trail by which the US would levy tariffs at the same rates that other countries apply to the equivalent products made in the US.

The US had started to re-examine the exemption for low-value packages, known as de minimis, before Trump entered office.The Biden administration in September proposed to tighten the rules on such packages from China, saying the move would help US firms compete and address challenges blocking shipments of illicit drugs.

In 2016, the US had raised the threshold for exemption from tariffs and other fees from $200 to $800 to facilitate trade and allow officials to focus on higher priority shipments.

But that decision has faced criticism as e-commerce has rapidly expanded and the number of packages entering the US under the $800 limit surged from 140 million to more than 1.3 billion last year.Over the summer, voters rejected Liberal candidates in a handful of special elections in once-safe Liberal seats, leading to the beginning of internal party unrest.

He had become an increasingly polarising figure for the electorate - with Trudeau saying on Monday "it's time for a reset" and for the "temperature to come down" in Canadian politics.Andrew Perez, a principal at Perez Strategies, said it will be a challenge now for the Liberals to distance themselves from the Trudeau brand.

"That was a major aspect of their success - but that worked until it didn't," the Liberal strategist told the BBC.Public opinion polls for the Liberals had reached new depths in recent weeks, and attempts to change course with cabinet shuffles and tax breaks failed to make a dent.