He has cut short his Christmas break and is returning to Westminster to deal with what he described as a "major incident" unfolding in waters off the south coast of England.
It comes after six men, all Iranian nationals, were found on a beach next to an inflatable boat at Kingsdown on Sunday.
Lucy Moreton, a spokesman for the Immigration Services Union, said it was "very hard to know" how much the French authorities were doing.
Home Secretary Sajid Javid has called the crossings a "major incident" and reached out to French officials for more coordination.
But he resisted calls to deploy more cutters to the Channel, saying he was keeping the number of vessels available to the Border Force "under close review".
Mr Javid is under pressure to "get a grip" on the issue of migrants attempting to cross the English Channel amid criticism over the Government's response.
Almost 70 people have been intercepted in the past three days as they try to reach England by crossing one of the world's busiest shipping lanes.
Matt Crittenden, of the Littlestone-on-Sea lifeboat station, told AFP its search and rescue helicopter had spotted them and alerted police.
Shadow home secretary Diane Abbott accused Mr Javid of exploiting the problem.
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There has been a recent spike in attempts to from the Channel from France.
He said he was considering whether to bring Border Force Cutters on operations in the Mediterranean back to the Channel, although he was yet to make a decision.
Sky News has seen evidence of six suspected migrants being met by United Kingdom border officials on a south coast beach this morning.
But writing in the Daily Telegraph, he admitted that numerous factors behind the increase in crossings are "outside of our control".
Their attempts are not unique - the number of migrants attempting to reach the United Kingdom by boat has grown over the past several months.
She said: "It is feasible that were we to put additional craft (out) they might act as a magnet - encouraging people to make a perilous crossing".
The Home Office said Sunday the men have been given medical checks and turned over to immigration officials for processing.
Chris Hogben, from the NCA, said its work with French colleagues had resulted in dozens of attempted crossings being prevented.
One French MP said smugglers were using uncertainty over Brexit to make false assertions to migrants that they should cross now as security will be tighter later.