A former Border Patrol sector chief told lawmakers that he was blocked from informing the public about migrants who may be potential terror threats, as he says the Biden administration wanted to downplay the threat.

"In San Diego, we had an exponential increase in Significant Interest Aliens [SIAs]. These are aliens with significant ties to terrorism," former San Diego Sector Chief Patrol official Aaron Heitke told lawmakers on the House Homeland Security Committee.

"Prior to this administration, the San Diego sector averaged 10-15 SIAs per year. Once word was out that the border was far easier to cross, San Diego went to over 100 SIAs in 2022, way over 100 SIAs in 2023 and more than that this year," he warned. "These are only the ones we caught."

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Heitke says he was told he couldn’t release information about that increase.

"At the time, I was told I could not release any information on this increase in SIAs or mention any of the arrests. The administration was trying to convince the public that there was no threat at the border," he said.

Fox News Digital reached out to the Department of Homeland Security for comment on Heitke’s remarks.

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The remarks came as part of a House Homeland Security Committee hearing called "A Country Without Borders: How Biden-Harris’ Open-Borders Policies Have Undermined Our Safety and Security." 

Immigration is a top 2024 election issue, and Republicans have blamed Biden administration policies and the rolling back of Trump-era policies for the crisis.

"As we continue to witness Biden and Harris’ resistance to doing anything meaningful about this disaster, we have to ask — why? Why did they let this crisis take place and why have they let it continue," Chairman Mark Green, R-Tenn., told the committee.

Heitke also told the committee that he would release illegal aliens "by the hundreds" each day, and flights were provided to send migrants from San Diego to Texas, at approximately $150,000 per flight. He also testified that he had to shut down San Diego traffic checkpoints to divert resources to the border, and that those checkpoints are crucial for the interdiction of drugs like fentanyl.

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Democrats and the administration have accused Republicans of failing to back funding and reform bills — including a bipartisan Senate bill released this year — and say that recent moves by the administration are working to bring down border encounters and secure the border.

"While you probably won't hear it from those on the other side, border encounters are at their lowest level in years since the president's proclamation on June 4, and encounters along the border and ports of entry have decreased by 55%, with Border Patrol recording the lowest number of border encounters since September 2020," ranking member Bennie Thompson, D-Miss., said at the hearing.

A new statewide poll in California found that nearly three-quarters of Golden State residents support making changes to "Prop 47" – the 2014 public referendum that reduced penalties for larceny, forgery and drug offenses. 

Critics have blamed the current policy – which includes the provision deeming shoplifting under $950 a misdemeanor – for the crime wave gripping urban areas of the state.

In the poll, conducted by the Public Policy Institute of California, 71% of likely voters say they will vote "yes" on "Prop 36" – the ballot initiative that seeks to make such revisions.

The highest support came from residents of the Inland Empire east of San Diego and bordering Arizona – at 79% – with the lowest coming from the Bay Area at 64%.

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Sixty-three percent of Democrats and 85% of Republicans support Prop 36, according to the poll, which met Fox News’ polling standards.

Prop 36 will allow felony charges for certain types of drug possession and thefts under $950, if the defendant has two such prior convictions, according to the California Department of State. It will also apply more serious penalties for fentanyl dealers.

The department said approving Prop 36 could also lead to millions of dollars in "state criminal justice costs," according to its "Fiscal Impact" section.

Prime supporters include Crime Victims United and the California District Attorney’s Association, while opponents include Contra Costa County District Attorney Diana Becton, according to CDOS.

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The poll surveyed more than 1,000 likely voters and was conducted from Aug. 29 to Sept. 9.

Prop 36 was originally introduced in part by two Democrats, Gov. Gavin Newsom and Senate President Pro Tempore Mike McGuire, in July, according to reports.

"Californians want safer, stronger communities, and we’re delivering exactly that with this commonsense approach," McGuire said in a statement.

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"These are a methodical set of measures that will crack down on retail theft and hold offenders accountable for hardcore drug crimes, without enacting the Draconian policies of the ‘80s and ‘90s that devastated communities of color and cost taxpayers billions of dollars."

Fox News Digital also reached out to California Republicans for comment.

The PPIC’s survey director told the Sacramento Bee that of the 10 ballot initiatives primed for November, Prop 36 is getting the most attention:

"Proposition 36 on crime sentences currently leads in support, interest, and importance among the 10 state propositions," Mark Baldassare said.