“a nation of immigrants” — a change in tone compared to the Trump administration that removed the phrase from the mission statement of CIS.
If CIS refers to the Center for Immigration Studies, which worked closely with the Trump WH, I wonder if the Orange Blob actually removed the phrase from CIS, as they claim to be an independent, non-partisan, non-profit research org.
(Others might say CIS is a hate-filled, anti-immigrant, white supremacist org, but it is a tough call 
)