Seattle's socialist Mayor Katie Wilson has indicated she will not limit her focus to the wealthy, dismissing concerns about millionaires leaving as Washington state Democrats pass an aggressive new income tax on high earners.

Washington state Democrats have passed a Senate bill proposing a 9.9% millionaire income tax, despite it being widely viewed as unconstitutional under decades of established legal precedent.

Democrats in Washington state have voted to implement a state income levy for residents earning over $1 million annually.