They are all, to some degree, statists and progressives.
Even Trump believes in the power of Federal Government and DC to engineer and effect change on society - of course, if wielded by the right people.
There may be some on his team, but who are the strict Constitutional constructionists? Austrian-school economists? Libertarians? Christian Anarchists?
THAT would be a big tent. RFK and Gabbard? Not so much.
The issue is that all Republicans/Conservatives truly do believe and love Big Government, as long as it's their big government. Not a single one that believes otherwise in office.