The French President called for tougher borders and a stronger national identity and accused the left of petty slander as he struggled to catch up with his Socialist rival.
Strauss-Kahn told London's Guardian newspaper he was convinced his political downfall was choreographed by his political enemies.
The Guardian said on its website on Friday that Dominique Strauss-Kahn believes his French presidential bid was scuppered last year by "political enemies" linked to President Nicolas Sarkozy.
French President Nicolas Sarkozy ruled out any alliance with the far-right National Front of Marine Le Pen, backed by one in five voters in the first round of the presidential election.
French President Nicolas Sarkozy appealed directly to far right voters on Monday with pledges to get tough on immigration and security, after a record showing in a first round election by the National Front made them potential kingmakers.
Socialist Francois Hollande and conservative Nicolas Sarkozy go head-to-head in France's presidential runoff, but a third figure looms large in the campaign: the leader of the nation's far-right National Front.
Francois Hollande, who topped the first round of a presidential election on Sunday, promises to spare France harsh, Greek-style austerity and to refocus Europe on economic growth if he becomes France's president.
Voters were turning out Sunday in solid numbers for the first round of France's presidential election, with conservative President Nicolas Sarkozy's political career on the line amid frustration over his personal style.
The French President's re-election hopes suffered a double setback with a string of public defections coupled with a fall in opinion polls.