Morning top 5: Court ruling on Brexit; men in court for alleged trafficking; and Turnback Tuesday

The top stories this Tuesday morning...

Britain's highest court will this morning deliver a landmark ruling on Brexit.

The UK Supreme Court has been asked to rule on whether the British government can trigger Article 50, without first consulting parliament.

Triggering Article 50 will formally start the process of the UK exiting the European Union.

British Prime Minister Theresa May wants to press ahead without getting parliamentary approval.

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Three men will appear in court later after an alleged human-trafficking operation was detected at Dublin Airport.

Gardaí believe two of the men - who are Aer Lingus staff members - were trying to help a third man enter the country without passing through immigration.

The three - aged 28, 56 and 61 - are currently being held at Ballymun, Swords and Coolock garda stations.

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Police in Belfast are questioning two more men in connection with the attempted murder of a PSNI officer.

The officer was shot twice in the arm at a petrol station on the Crumlin Road on Sunday.

The men - aged 30 and 39 - were arrested last night in Belfast - a 36-year-old man was detained on Sunday.

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Over 2,000 people are diagnosed with lung cancer in Ireland each year.

The Irish Cancer Society says that early detection of the disease can significantly improve mortality rates.

The charity is holding an event today to discuss the latest research on prevention, treatments and ways to reduce the numbers of people getting the disease.

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Today has been branded "Turnback Tuesday".

Psychologists say today is the day that people are most likely to break their New Years's resolutions.

They say a combination of boredom and frustration make many of us return to our bad habits.