The French prime minister has warned that an election win for the National Front could provoke a 'civil war'.

Manuel Valls' comments came as Marine Le Pen, the leader of the far-Right group, vowed to 'ruin the life' of the Socialist government headed by President Francois Hollande.

The controversial politician has attacked her opponents, accusing them of tactical voting in an effort to prevent her party from making a breakthrough.

She told French radio station RMC: 'I am going to ruin the life of the government, do you hear me? Every day of the week, every minute of the day, they will hear about me.'

Marine Le Pen, National Front leader, right, posed with a fan at the Lille international market in northern France while out on the campaign trail in advance of the second round of voting for the regional elections on Sunday

Ms Le Pen, centre, has vowed to 'ruin the life' of President Francois Hollande's Socialist government

Ms Le Pen has accused the Socialist party of acting in an undemocratic fashion after it announced it was pulling out two vital regional elections, urging its supporters instead to vote for Nicolas Sarkozy's party to thwart the National Front.

France's National Front may be defeated in the regional elections as an opinion poll showed tactical voting will keep it from power in two main target regions.

The possibility of defeat at the final run-off would be a devastating blow for the far-right party who topped a first round vote nationally.

However, Prime Minister Manuel Valls warned that voting for Le Pen's party on Sunday would be a vote for 'civil war'.

According to Le Figero, Mr Valls claimed: 'There are two options for our country. There is an option which is that of the extreme right, which basically advocates division. This division may lead to civil war. There is another vision, which is that of the Republic and its values.'

The far-Right party's leader Marine Le Pen was upbeat over her prospects of victory in an interview today but admitted 'a good portion of the key to the result is in the hands of those who abstained.'

'I hope to be elected. We will show what we are able to do,' Le Pen told BFM TV.

French Prime Minister Manuel Valls warned the electorate that voting for Ms Le Pen, pictured, could lead to 'civil war'

In the first round on 6 December, the National Front won more than 40 per cent of the vote in the north, where Le Pen is standing.

Victory in the regionals on Sunday would boost her profile ahead of presidential elections in 2017.

It won by a similar margin in the south-east, where her niece Marion Marechal-Le Pen leads the party list.

Fears over immigration and the deadly ISIS attacks in Paris have played an important factor in the party's rise.

Similarly general disaffection with mainstream politics and frustration at high unemployment were among factors driving the party's best performance in its history.

Since the first round, however, the third placed Socialist Party has pulled out of the race in both those key regions.

The party has urged its supporters to back Nicolas Sarkozy's The Republicans to keep the National Front out of power.

In the northern region of Nord-Pas-de-Calais-Picardie, Le Pen would win 47 per cent of the vote while Xavier Bertrand, a former minister with the conservative The Republicans, would get 53 per cent, the TNS Sofres-OnePoint poll showed.

In the southern Provence-Alpes-Cote d'Azur region, Marechal-Le Pen would get 46 per cent against 54 per cent for Christian Estrosi, the conservative mayor of the Riviera city of Nice.

The poll found that 77 per cent of left-wing voters in the two regions planned on voting for the conservatives with only 14 per cent expected to abstain from voting.

The poll for newspaper Le Figaro and television channel LCI was conducted online 8 December with 803 respondents in both regions. However Wednesday's poll did not consider other regions.

Another of the six-out-of-13 regions where the National Front topped the first round was Alsace-Champagne-Ardenne-Lorraine in the east where it won 36 per cent of the vote.

Victory in the regionals on Sunday would boost her profile ahead of presidential elections in 2017

In the first round on December 6, the National Front won more than 40 per cent of the vote in the north, where Le Pen is standing

Defeat from the jaws of victory? Marine Le Pen speaking following the results of the first round

There, Socialist lead candidate Jean-Pierre Masseret is resisting the party's call to step down, making the outcome of the three-way vote uncertain.

A survey by Elabe pollsters showed the conservative candidate attracting 43 per cent of the vote in that region, slightly ahead of the FN's number 2 official Florian Philippot, who would get 41 per cent - the difference between the two being within the margin of error. Some 16 per cent of those surveyed planned to vote for Masseret.

The National Front also came first in central regions Bourgogne-Franche-Comte, with 31 per cent, and Centre-Val de Loire, with 30 per cent, and in the southern region of Languedoc-Roussillon/Midi-Pyrenees, with 32 per cent.

The regional vote is the first with a smaller group of bigger regions under redrawn boundaries, and the Socialist Party which runs a deeply unpopular national government under President Francois Hollande, looks set to lose the domination of the regions it won in 2010.

The first round poll put the Socialists ahead in only two regions and Sarkozy's The Republicans ahead in four.

The Republicans have decided not to follow the Socialists' example by pulling out in regions where they are third placed.

The National Front won by a similar margin in the south-east, where her niece Marion Marechal-Le Pen leads the party list