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Unless the trust document itself states you are entitled to take any of the corpus of the trust, the trustee is wholly responsible for the corpus and must follow the terms of the trust. If there is no prohibition in the trust preventing the trustee from giving more money, then the trustee can exercise their own discretion as to whether or not to give it to you, but you cannot force the trustee to give it to you unless the trust says you have that right.
It is very difficult, if not impossible, to challenge a trustee in court when the trustee is complying with the terms of the trust. Thus, if the trustee refuses to give you anything from the trust body (corpus) and the trust does not mandate they do so, I am afraid that legally there is nothing you can do to force the trustee to act.
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