Ivanka Trump, the president’s daughter and a top adviser, jumped into the administration’s tax reform push on Wednesday, joining conservatives to promote an expansion of the child tax credit and later appearing onstage with her father at an event in North Dakota.

Ms. Trump told conservative leaders that the administration is pushing for “the largest child tax credit possible,” potentially doubling it to $2,000 per child, and said she wants to make it refundable against payroll taxes so that lower-income people who pay little or no federal income tax would still benefit.

“The issue of child care was central to the campaign and remains a key priority for this administration,” Ms. Trumpsaid at an event in Washington hosted by Americans for Tax Reform. “This administration is committed to keeping working families at the forefront of our agenda.”

Later in the day, Ms. Trump traveled with her father, President Trump, to stump for tax reforms in North Dakota. Mr. Trump briefly pulled his daughter on stage.