Customs and Border Protection officers saw a 5 percent decrease from March to April in the number of people deemed inadmissible and apprehended at the southern border and a 68 percent drop compared to last year, according to new data released Tuesday.

Border agents apprehended 11,129 people and declared 4,651 others inadmissible, bringing the total to 15,780 people. That number is down from 48,500 last April, when numbers tend to begin spiking due to warmer weather for the trek from Central America to the U.S.

Approximately 12,193 people were apprehended in March and 18,756 were taken into custody in February.

The April numbers maintain last month's record of the lowest numbers in 17 years.

In February, Kelly said the "unprecedented" drop from 31,578 apprehensions in January reflects a reduced flow of illegal immigrants, and indicates Trump's policies and executive actions on immigration - calling for a new border wall and follow-through of all immigration laws — are already causing some to stop before coming.

Although illegal entrant numbers typically rise during the spring and summer months, Kelly added that the administration's early efforts to thwart these problems indicate continued action will have an effect in the coming months.

CBP said it expects a seasonal uptick in apprehensions and inadmissibles in the coming summer months based on historic trends.