If this is a meeting for discovery, OK.

Ostensibly, that's why:

The Prime Minister's Office (PMO) said Roberts is speaking to cabinet about trade issues because he knows the Trump administration's playbook.

Roberts's book Dawn's Early Light: Taking Back Washington to Save America includes a foreword written by U.S. Vice-President JD Vance

The PMO added it would be beneficial for cabinet to hear Roberts's perspective and understand the White House's priorities as the government prepares for the Canada-U.S.-Mexico Agreement (CUSMA) review next year.