The New Jersey Democrat made the comment Saturday at event in Alabama

Booker has been campaigning there against Republican candidate Roy Moore

More than a dozen women have accused Trump of groping or peeping on them

Trump has steadfastly denied the claims; Franken apologized and resigned

Cory Booker has called on President Donald Trump to resign, saying that Al Franken did 'the honorable thing' by stepping down from the senate.

Booker, the Democrat senator from New Jersey, made the remarks on Saturday at an event in Montgomery, Alabama, where he is campaigning against Republican senate candidate Roy Moore.

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'I just watched Senator Al Franken do the honorable thing and resign from his office,' Booker told Vice News at an event for Democrat Doug Jones, Moore's challenger.

'My question is, why isn’t Donald Trump doing the same thing - who has more serious allegations against him, with more women who have come forward. The fact pattern on him is far more damning than the fact pattern on Al Franken,' Booker said.

'Why hasn’t Donald Trump come forward and said, "You know what, in this climate, at this point in this country, I’m going to resign from my position just like Al Franken",' Booker said.

Senator Cory Booker (standing) made the remarks Saturday night at a campaign event for Alabama senate candidate Doug Jones (seated), the Democrat opposing Roy Moore

Senator Al Franken announced his resignation on Thursday. Seven women have accused him of groping or other misconduct - some of which allegations are 'simply not true', he said

At least 15 women have accused Trump of groping, unwanted kisses, or leering at pageant contestants in their dressing rooms, allegations that he has steadfastly denied

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Franken on Thursday announced he would resign from the senate after at least seven women accused him of groping or sexual harassment.

At least 15 women have accused Trump of groping, unwanted kisses, or leering at pageant contestants in their dressing rooms.

However, Trump has steadfastly denied the allegations since they emerged during his presidential campaign.

Franken quickly apologized after a photo emerged of him appearing to grope sleeping radio host Leeann Tweeden on a 2006 USO tour. He later disputed some of the allegations against him as 'simply not true'.

Yet Franken's resignation, which followed that of Congressman John Conyers, a Democrat, has upped the pressure on on political figures who have faced sexual misconduct allegations - including Republicans Trump and Moore.

Moore has vehemently denied allegations that he sexually touched a 14-year-old in the 1970s, when he was in his 30s.

With Moore leading slightly in the polls ahead of Tuesday's special senate election, he has been elusive on the campaign trail, appearing fewer than 10 times in the past month.

Moore is leading slightly in the polls ahead of Tuesday's special senate election, he has been elusive on the campaign trail. He was last publicly seen at this rally on December 5

Moore's Democrat opponent Doug Jones (left) has been racing around the state in the campaign's final days, appearing with New Jersey Senator Cory Booker (right)

In contrast Jones, his opponent, has been racing around the state, appearing with Booker and former Massachusetts Governor Deval Patrick in an aggressive push to turn out black voters.

Jones will need black voters to turn out for him at rates near what former President Barack Obama saw in the state, a tall order for an off-year special election in December.

Moore, an insurgent candidate who defeated the establishment GOP's pick in the primary, may face further challenges even if he wins on Tuesday.

Booker raised the possibility of expelling Moore from the senate - a procedure that has not succeed since 1862, and which would require Republican participation to reach a two-thirds majority.

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'I am worried, there are former pages that are showing worry, there are Republican senators that are worried - we’re all worried about this nightmare of a person that could come to the United States senate,' Booker said.