Stonewall

stone·wall
/ˈstōnˌwôl/
verb
  1. delay or block (a request, process, or person) by refusing to answer questions or by giving evasive replies, especially in politics.
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In only 30 minutes members of the Liberal-dominated House of Commons justice committee stonewalled an invitation to the former attorney-general Jody Wilson-Raybould for a second round of testimony on how senior government officials pressed her to abandon the prosecution of SNC-Lavalin.