Code erreur: Fatal error: Call to a member function fetch()

<?php 
	$articles = $bdd->query('SELECT * FROM news_tab_articles ORDER BY id DESC');
	while($a = $articles = $articles->fetch()) { ?>
	<p><?= $a['news_titre'] ?></p><br/>
	<?= $a['news_contenu'] ?>
	<?php
 }	
?>

SELECT * FROM news_tab_articles ORDER BY id DESC

while($a = $articles = $articles->fetch()) {

while($a = $articles->fetch()) {

<?php	
	$articles = $bdd->query('SELECT * FROM news_tab_articles ORDER BY id DESC');
	while($a = $articles->fetch()) { 
?>
	<p><?= $a['news_titre'] ?></p><br/>
	<?= $a['news_contenu'] ?>
	<?php 
}	
?>

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