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If you have asked them to leave and they don't, aren't they comitting criminal trespass ?

PC §30.05. CRIMINAL TRESPASS. (a) A person commits an offense if the person enters or remains on or in property of another, including residential land, agricultural land, a recreational vehicle park, a building, or an aircraft or other vehicle, without effective consent and the person:
(1) had notice that the entry was forbidden; or
(2) received notice to depart but failed to do so.(b) For purposes of this section:
(1) “Entry” means the intrusion of the entire body.
(2) “Notice” means:
(A) oral or written communication by the owner or someone with apparent authority to act for the owner;