KEENE, N.H.  - Bill Clinton is back on the presidential campaign trail - and so is his baggage.

For months, the former president has largely stayed out of the 2016 race, mentioned mostly in passing by Democratic front-runner Hillary Clinton.

Now, following days of attacks over his sexual history from Republican front-runner Donald Trump, Clinton is escalating his public involvement in his wife's campaign. On Monday, he heads out for his first solo campaign events with stops planned in New Hampshire, a key primary state that gave much-needed momentum to his struggling 1992 presidential bid.

But some of the less desirable moments of his past - his impeachment and decades-old sex scandals- are also re-emerging as he prepares to campaign.

So far, Bill Clinton has remained mum about the accusations.