The event would be similar to Trump's Pentagon visit for the swearing in of retired Gen. James Mattis as Defense secretary, during which he signed executive orders restricting immigration from seven majority-Muslim nations, Inside EPA's source said.
Myron Ebell, who directed EPA staffing for the Trump transition team, told Inside EPA in a Feb. 7 interview he expected a rollback of the EPA's climate change programs to be delivered in one or more executive orders.
One of Reuters's sources said attendees at the EPA staff meeting were told Trump would sign between two and five executive orders.
The executive orders could repeal former President Barack Obama's Climate Action Plan, a framework for reducing greenhouse gas emissions, and the Clean Power Plan, which regulates carbon emissions from power plants, Inside EPA reported.
The source said one of the planned executive actions will be directed at the State Department. Inside EPA said that suggests it may relate to the Paris Agreement, an international accord to reduce the impact of climate change, which Trump has threatened to abandon or defund.
The Senate Committee on Environment and Public Works moved forward Pruitt's confirmation earlier this month despite a boycott by Democratic members.
Pruitt drew national attention for suing the EPA over Obama-era regulations while serving as Oklahoma's attorney general. He has questioned the science behind climate change and advocates giving states greater control over energy industry regulation.
—Reuters contributed to this report.