In the wake of Donald Trump's presidential win, students at universities across the country and in California have started a "Sanctuary Campus" movement.

The idea of President-elect Trump, a Republican candidate who ran on tough immigration policies, has stirred up fears among some who believe his administration would deport undocumented immigrant students in the United States.

"In the week since Donald Trump's victory in the presidential election, I have heard from and met with students in our UC, CSU, and Community Colleges systems who have echoed the nationally reported fears expressed by undocumented and minority U.S. residents," California's Lt. Gov. Gavin Newsom wrote in a letter to the heads of California's three higher education systems on Thursday.

Newsom, who sits on the UC Board of Regents and is currently campaigning for the 2018 gubernatorial race, is proposing the state make all of its UC, CSU and community college campuses "Sanctuary Campuses."

What is a "Sanctuary Campus" exactly?

At the local government-level, it means a city or county has adopted policies that limit local law enforcement's cooperation with federal immigration authorities. For college campuses involved in the new movement, petitions circulating say becoming a "Sanctuary Campus" would mean "support for and protection of undocumented people and their families on our campus."

In Newsom's letter, he went on to say California's higher education systems should look to protect student data from "abuse by the Federal Goverment."

He's also asking for a review how campus police and administrative officials are trained to cooperate with immigration police, and asking the UC, CSU and community college systems commit themselves to not sharing students' personal information with the federal government.

Cal State Chancellor Timothy White on Wednesday already issued a statement saying saying the 23 college system is "deeply committed to fostering a campus community that is safe and welcoming for everyone."

He said campus police departments would not honor immigration hold requests and schools would support students who have applied for President Barack Obama's Deferred Action for Childhood Arrivals (DACA) policy, one-third of which are students in California.

Newsom also took to Facebook Live to address questions about his proposal: