Actions speak louder than words. Note carefully if President Trump tweets about Christie’s remarks. If he does not, it is a reasonable inference that Trump does not disagree with some or all of what Christie said.
I believe this was the case in mid-November when Christie went on Meet the Press? and criticized the efforts of the Trump legal team regarding the election. President Trump never tweeted in response to that - which I took as President Trump being in agreement with what Christie said.
Oh please. Never assume anything.