Washington, July 22 -- More than 43,000 people were booked into US Immigration and Customs Enforcement (ICE) detention in June, marking the highest monthly total since President Donald Trump returned to office, according to newly released ICE data.

The increase follows pressure from the White House for tougher immigration enforcement. While Department of Homeland Security (DHS) officials have denied the existence of arrest quotas, sources previously told CBS News that ICE agents had been instructed to target 2,000 arrests a day.

June's total equated to an average of 1,438 arrests per day. Data covering the first 11 days of July showed the daily average had risen further to 1,593.

The increase has come despite the absence of large-scale, ...