Republican presidential front-runner Donald Trump kicked off the week by bashing his GOP rival Chris Christie, Democratic counterpart Hillary Clinton and her husband, as well as the largest newspaper in New Hampshire.

The real-estate tycoon on Dec. 28 tweeted about Clinton's promise to increasingly use her "secret weapon," Bill Clinton, on the campaign trail, suggesting the former president might be more of a liability than a benefit. 

Presumably, he made this comment in reference to the Monica Lewinsky scandal of the 1990s. 

The GOP presidential hopeful did not elaborate exactly what "abuse" he was referring to, however. The Hillary Clinton campaign, for its part, declined to comment on the particular remark but used the opportunity to chide Trump over his frequently controversial statements.

"Hillary Clinton won't be bullied or distracted by attacks he throws at her and former President Clinton," spokeswoman Christina Reynolds said.

"When his insults are directed at women, immigrants, Asian-Americans, Muslims, the disabled, or hard working Americans looking to raise their wages ... Donald Trump's words are demeaning, his policies are just as destructive," Reynolds added.

Battling to win the key early primary state of New Hampshire, meanwhile, Trump also took on New Jersey Gov. Chris Christie, whose poll numbers have been improving in the Granite State, CBS News reported.

Christie's home state "had tremendous downgrades, either 9 or 11," and it's the worst state in the country in terms of "economic development," the billionaire businessman said about the Garden State's credit ratings, though the number is actually 8, according to Politifact.

The New Hampshire Union Leader, the state's most important newspaper, meanwhile, is "dying," Trump noted after its publisher, Joe McQuaid, had written pundits who believe Trump could win his party's nomination were "(insulting) the intelligence of Republican voters."

Trump said McQuaid is "a low life" and a "very dishonest man" in an interview on Manchester, New Hampshire, television station WMUR.