Republicans fed-up with the Biden administration’s inaction on the southwest border are warning the head of the Department of Homeland Security he faces congressional action from a GOP majority if he fails to do his duty and tighten border security after nearly two years of record illegal immigration and drug smuggling.

In a letter to DHS Secretary Alejandro Mayorkas, Sens. Lindsey Graham (R-S.C.) and Ted Cruz (R-Texas) warned that they have “grounds for impeachment” over his refusal to correct his “gross dereliction of duty” along the U.S.-Mexico border, Fox New Digital reported Thursday.

The letter contained information that was compiled by U.S. Customs and Border Protection (CBP), showing the crisis along the border has gotten worse in the 19 months Mayorkas has been on the job.

It should also be noted that shortly after taking office, President Joe Biden assigned the task of securing the border to Vice President Kamala Harris, who has only visited the border once and has done little else to address the issue.

“This is gross dereliction of duty and, if not corrected swiftly, could provide grounds for impeachment,” the senators wrote.

“Your failure to faithfully enforce this nation’s immigration laws and willful blindness to the very real humanitarian crisis at our southern border amounts to a gross dereliction of duty and a violation of your oath of office,” they added.

“Despite the heroic efforts by the men and women of Border Patrol, who operate with very little support from Washington, D.C., you have failed to achieve any semblance of operational control of the southern border,” the senators noted further.

According to CBP, they said, there have been “over 4.4 million illegal crossings, including over 3.5 million apprehensions by CBP and at least 900,000 gotaways, who evaded apprehension.”

Fox News Digital continued:

In addition to the record-high border crossings and migrant encounters, the senators charge Mayorkas with enabling a drug production and smuggling enterprise by Mexican cartels with China-supplied drug ingredients that directly contributed to the “fentanyl-fueled” opioid pandemic that killed 108,000 Americans last year.

Fentanyl, which has become the leading cause of death of Americans ages 18 to 45, is “streaming across our southern border,” the senators wrote, noting that just last month 2,287 pounds of fentanyl were seized by CBP agents — enough to kill more than 500 million people.

“Drug cartels produce bulk amounts of fentanyl in Mexico, using the Chinese-supplied ingredients, and smuggle the drug across the U.S.-Mexico border,” the senators explained. “This amounts to a multi-billion dollar business for transnational criminal organizations, who then launder the money out of the United States and back into China.

“This lucrative illicit enterprise continues to thrive—while Americans die—all because DHS has ceded control of our southern border to the cartels for political gain,” the two GOP senators added.

They also wrote that the “chaos” at the border “presents a prime opportunity for terrorists to enter the United States undetected.” They added that the “disastrous withdrawal” of American troops from Afghanistan in August 2021 likely contributed to Border Patrol agents apprehending at “least 78 individuals on the Terrorist Screening Database” so far in fiscal year 2022, which is twice as many as the past five fiscal years combined.

“It is a near certainty that terrorists have already entered the United States undetected, taking advantage of the lenient border policies you have put into place,” the senators noted. “It is only a matter of time until we will see an attack on American soil from such terrorists.”

“You have stated multiple times that ‘the border is secure’ even as the crisis rages on,” the letter said. “Vice President Harris apparently shares this same delusion. Perhaps if she or President Biden would visit the southern border and actually see the unending surge of illegal immigration, illicit drugs and human suffering, the White House would feel differently.”

The senators then dropped a warning.

“We fully expect that in a few months’ time a Republican-led Congress will hold you to account for your willful negligence regarding the security of the southern border and the safety of the American people,” they concluded.