タクソノミー一覧ページで日付順ソートボタンが効かない

<ul>
<li><a href="<?php echo add_query_arg( array('sort' => 'date', 'order' => 'DESC') ); ?>">投稿が新しい順</a></li>
<li><a href="<?php echo add_query_arg( array('sort' => 'date', 'order' => 'ASC') ); ?>">投稿が古い順</a></li>
</ul>
<?php $url = $_SERVER['REQUEST_URI']; ?>
<?php if ( strstr($url,'?sort=date&order=DESC')==true ):
	$orderbySet = 'date';
	$orderSet = 'DESC';
	elseif ( strstr($url,'?sort=date&order=ASC')==true ):
	$orderbySet = 'date';
	$orderSet = 'ASC';
	else:  endif; ?>
	<ul>
		<?php
		$type = get_query_var( "news-cat" );
		"order" => $orderSet,
		"orderby" => $orderbySet,
		$args = array(
			"post_type" => array( "news" ),
			"tax_query" => array(
				"relation" => "OR",
				array(
					"taxonomy" => "news-cat",
					"field" => "slug",
					"terms" => $type,
				),
			),
			"paged" => $paged,
			"posts_per_page" => "-1"
		);
		$the_query = new WP_Query( $args );
		if ( $the_query->have_posts() ): ?>
		<?php while ($the_query->have_posts()): $the_query->the_post(); ?>
		<li>　～　</li>
		<?php endwhile; ?>
		<?php wp_reset_postdata(); ?>
		</ul>

上記コードで自己完結しました。