A neighbour has claimed Isidro Garcia "was always watching" his captor from a window whenever she left the house.
Maribel Garcia said it appeared that the woman - who was kidnapped by the 41-year-old 10 years ago - "knew she had to do what he said".
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The senior officials, including the head of leader Paul Nuttall's branch, condemned comments from him and millionaire backer Arron Banks.
Lukasz Pawlowski cut his throat with a kitchen knife as he was due to be sentenced in Havefordwest. He has been remanded in custody.
More than 1.85 million people have called for the US president's visit to be watered down to avoid causing "embarrassment" to the Queen.