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Homeland Security secretary Kirstjen Nielsen has resigned amid Donald Trump's growing frustration over the number of migrants crossing the southern border.

The US president said in a tweet he had accepted Ms Nielsen's resignation.

In another tweet, Mr Trump also announced that Kevin McAleenan, the current US Customs and Border Protection commissioner, would become acting head of the department.

Mr McAleenan is a long-time border officer, reflecting Mr Trump's priority for the department of 240,000 people, initially founded to combat terrorism after the September 11 attacks.

The move comes amid growing frustration by the Trump administration over the number of Mexicans and Central Americans entering the US without proper documentation.

Mr Trump has insisted that the arrival of immigrants across the southern border constitutes a national emergency.

He recently threatened to close the border, or parts of it, if Congress did not change US laws to fix what he called immigration "loopholes".

:: Donald Trump warns migrants: 'We can't take you. Our country is full'

Tensions between the White House and Ms Nielsen had been ongoing almost from the moment she became secretary in December 2017, after her predecessor John Kelly became the White House chief of staff.

Ms Nielsen, 46, was viewed as resistant to some of the harshest immigration measures supported by the president and his aides, particularly senior adviser Stephen Miller, both around the border and on other matters like protected status for some refugees.

After Mr Kelly left the White House last year, Ms Nielsen's days appeared to be numbered. She had expected to be pushed out last November, but her exit never materialised.

However in recent weeks, as a new wave of migration emerged along the border and as Mr Trump seeks to regain control of the issue for his 2020 re-election campaign, tensions have flared.