Sen. Lindsey Graham, R-S.C., on Tuesday warned that the U.S. border will be "overrun" unless the incoming Biden administration sends a message to the incoming migrant caravans that they support President Donald Trump’s policies on immigration.

"If the Biden Administration does not immediately send a clear and unmistakable signal that they support the tough policies implemented by President Trump," Graham tweeted, "it will be just a matter of time before our border is overrun again."

Graham’s warning comes just one day before Biden will be inaugurated as the nation’s 46th president. In the past week, a migrant caravan formed in Honduras began making its way to the U.S.-Mexico border.

A migrant within the group was interviewed over the weekend saying people like him were motivated to make the journey to the U.S. on the belief that Biden’s administration will implement more favorable immigration policies than his predecessor.

President-elect Joe Biden tears up as he speaks at the Major Joseph R. "Beau" Biden III National Guard/Reserve Center, Tuesday, Jan. 19, 2021, in New Castle, Del. (AP Photo/Evan Vucci)

The migrant also referenced Biden’s promise on the campaign trail that he would suspend deportations for 100 days after taking office.

By Tuesday, the caravan had largely dissipated after it entered Guatemala and was met by security forces. Small groups pressed on toward the Mexican border, while others accepted rides from authorities back to Honduras.

ASYLUM SEEKERS CALL ON BIDEN TO REVERSE TRUMP IMMIGRATION POLICIES, PROTECT 'VULNERABLE' POPULATIONS

During a recent interview with Univision's Ilia Calderón, Vice President-elect Kamala Harris gave a preview of the incoming administration’s immigration plan.

Harris said the administration plans to create "great efficiencies" to streamline the naturalization process, including decreasing the amount of time required to acquire U.S. citizenship from 13 years to eight years, offering certain members of the Temporary Protected Status and Deferred Action for Childhood programs automatic green cards and adding immigration judges to help eliminate backlogs on court hearings.

"We believe it is smarter and a more humane way of approaching immigration for immigrants," Harris said. 

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The full plan will be sent to Congress on President-elect Joe Biden's first day in office.

Fox News’ Lucas Manfredi and The Associated Press contributed to this report.