The phrase "a challenge from within" is correct and usable in written English.
It can be used to describe an internal struggle or difficulty that arises from one's own thoughts, feelings, or circumstances.
Example: "The organization faced a challenge from within, as employees began to question the leadership's decisions."
Alternatives: "an internal struggle" or "a conflict within".
Now the deal faces a challenge from within.
Each time he faces a challenge from within, he wins, but seems to be sapped of some of his prestige.
With other problems to juggle, a challenge from within its own base is not what the Sudanese government needs.
The truth is that, whatever his state of mind, Mbeki has good reason to fear a challenge from within the ANC.
The host predicted that President Obama would have a miserable term and face a challenge from within his own party in 2012, likely from Hillary Clinton.
B6 A Challenge From Within Most New York Democrats assume that Attorney General Eliot Spitzer will be the party's candidate for governor next year.
Despite this, on 9 February he survived a challenge from MPs within his own party that had threatened to remove him from the top job less than 18 months in.
Cardin, the ranking Democrat on the Senate Foreign Relations Committee, has an extensive fundraising base in Maryland and is not considered particularly vulnerable to a challenge from any known figures within the state.
The BBC's Beth McLeod in Washington says Thad Cochran's victory, although narrow, will come as a relief for moderates who were faced with a challenge from hard-line conservative groups within the party.
TOKYO — After just three months in office, Prime Minister Naoto Kan of Japan faces a challenge from a scandal-tainted power broker within his own party in a leadership race that could hamper the government's response to a debilitating economic slowdown.
Less than a year later, he was out of a job, having lost a leadership challenge from within his own party.
