The Morrison government faces the prospect of an inquiry being held into one of its most-senior ministers, as it prepares to go into a tense personal battle with Labor over industrial relations in the final week of Parliament before the long winter break.

Labor will target construction boss Gerry Hanssen, a prominent Liberal Party member and donor, who was fined $60,000 by the Federal Court for blocking union officials from a building site where a worker had just died.

Pressure is on Prime Minister Scott Morrison to put the spotlight on employers. Credit:AAP

Mr Hanssen has donated up to $175,000 to the state and federal Coalition since 2014, Australian Electoral Commission records show. In 2008 he was fined $174,000 for exploiting foreign workers and a decade later, an audit alleged 93 employees were underpaid by more than $271,000.

Labor's industrial relations spokesman Tony Burke, heaped pressure on the Prime Minister to put the spotlight on employers.