Trump's top economic aide warns of more uncertainty over tariffs

U.S. President Donald Trump's top economic aide on Monday warned of more economic uncertainty stemming from Washington's evolving tariff policy.

Speaking to CNBC's "Squawk Box" on Monday, U.S. National Economic Council Director Kevin Hassett said there will be "some uncertainty" between "now and April 2nd", referring to the date Trump is set to unveil his "reciprocal" tariff plans.

His comments come as market analysts and business leaders have criticized the sweeping tariff announcements, which have led to volatility in the markets.

However, Hassett defended Trump's tariffs against Mexico, Canada and China, calling them "very positive developments" adding things will clear up after April 2nd.