Can I still apply for an ESTA if I have canceled my green card application?

Question Details: I am a British citizen, resident in Spain for 20 years. My daughter is a U.S. citizen and we are applying for a "green card" for me, through an immigration lawyer. Unfortunately I have just been diagnosed with cancer and have no health cover in the U.S. so I want to cancel the application for "Legal Permanent Resident" and just visit with my daughter in TN. The immigration lawyer we are using says that if I cancel my application, I will not be able to visit the U.S. at all, not even with an ESTA. Is this true?

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