The phrase "assist their case" is correct and usable in written English.
It can be used in legal, argumentative, or persuasive contexts where someone is trying to support or strengthen their position or argument.
Example: "The new evidence presented by the defense will assist their case in proving their client's innocence."
Alternatives: "support their argument" or "strengthen their position."
Wilpon and Katz have accused Picard of having kept evidence from them that would have assisted their case and that would have undermined his central argument.
The owners, in a 94-page filing in United States Bankruptcy Court in Manhattan, also accuse the trustee, Irving H. Picard, of having kept evidence from them that would have assisted their case and that would have undermined his central argument: that the owners, Fred Wilpon and Saul Katz, had turned a blind eye to a raft of warnings that Mr. Madoff might have been suspect.
Since then, Jill Eisenhard, the group's founder and executive director, reports, R.H.I. has trained a hundred and twenty-seven NYCHA residents to assist their neighbors in case of an emergency, and has created physical and virtual hubs for residents to post and receive information.
They can now assist their mothers in case of technical glitches.
And this week, Senate Republicans hired Joseph E. diGenova, a former federal prosecutor and political veteran with strong ties to Republicans in Washington, as a special counsel to assist their investigation of the case.
Sitting in their jail cells, they have no ability to investigate their cases or assist their lawyers, except in a limited and superficial way.
The Borena people's life is highly linked to social and cultural practices like Jila titling child name, 'marriage' bride price and Busa Gonofa where the clans assist their members with animals in case one lost livestock to natural disaster or raids; it also involves slaughtering animals for someone who is injured or has broken bones.
In both cases, the scaffolds assist their associated nucleases in multiple molecular settings.
The charges being dismissed had everything to do with the victims not wanting to assist in their case".
